feat: string and message value renderers for textual (#13510)

## Description

Closes: #12713 
Refs: #12878

Sign mode textual value renderers for string and message.

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

- [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [ ] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/main/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed 
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

tx/textual/internal/testdata/message.json

@@ -0,0 +1,139 @@
+[
+    {
+        "proto": {},
+        "screens": [
+            {"text": "Foo object"}
+        ]
+    },
+    {
+        "proto": {
+            "full_name": "nonempty"
+        },
+        "screens": [
+            {"text": "Foo object"},
+            {"text": "Full name: nonempty", "indent": 1}
+        ]
+    },
+    {
+        "proto": {
+            "full_name": "thing one",
+            "nickname": ":thing two"
+        },
+        "screens": [
+            {"text": "Foo object"},
+            {"text": "Full name: thing one", "indent": 1},
+            {"text": "Nickname: :thing two", "indent": 1}
+        ]
+    },
+    {
+        "proto": {
+            "full_name": "special child message",
+            "mtime": {
+                "seconds": 1136214245
+            }
+        },
+        "screens": [
+            {"text": "Foo object"},
+            {"text": "Full name: special child message", "indent": 1},
+            {"text": "Mtime: 2006-01-02T15:04:05Z", "indent": 1}
+        ]
+    },
+    {
+        "proto": {
+            "nickname": "empty child",
+            "left": {}
+        },
+        "screens": [
+            {"text": "Foo object"},
+            {"text": "Nickname: empty child", "indent": 1},
+            {"text": "Left: Foo object", "indent": 1}
+        ]
+    },
+    {
+        "proto": {
+            "nickname": "empty children",
+            "left": {},
+            "right": {},
+            "bar": {}
+        },
+        "screens": [
+            {"text": "Foo object"},
+            {"text": "Nickname: empty children", "indent": 1},
+            {"text": "Left: Foo object", "indent": 1},
+            {"text": "Right: Foo object", "indent": 1},
+            {"text": "Bar: Bar object", "indent": 1}
+        ]
+    },
+    {
+        "proto": {
+            "full_name": "subfield",
+            "left": {},
+            "right": {
+                "nickname": "junior"
+            },
+            "bar": {}
+        },
+        "screens": [
+            {"text": "Foo object"},
+            {"text": "Full name: subfield", "indent": 1},
+            {"text": "Left: Foo object", "indent": 1},
+            {"text": "Right: Foo object", "indent": 1},
+            {"text": "Nickname: junior", "indent": 2},
+            {"text": "Bar: Bar object", "indent": 1}
+        ]
+    },
+    {
+        "proto": {
+            "full_name": "deep",
+            "left": {
+                "left": {"nickname": "LL"},
+                "right": {"nickname": "LR"}
+            },
+            "right": {
+                "left": {"nickname": "RL"},
+                "right": {"nickname": "RR"}
+            }
+        },
+        "screens": [
+            {"text": "Foo object"},
+            {"text": "Full name: deep", "indent": 1},
+            {"text": "Left: Foo object", "indent": 1},
+            {"text": "Left: Foo object", "indent": 2},
+            {"text": "Nickname: LL", "indent": 3},
+            {"text": "Right: Foo object", "indent": 2},
+            {"text": "Nickname: LR", "indent": 3},
+            {"text": "Right: Foo object", "indent": 1},
+            {"text": "Left: Foo object", "indent": 2},
+            {"text": "Nickname: RL", "indent": 3},
+            {"text": "Right: Foo object", "indent": 2},
+            {"text": "Nickname: RR", "indent": 3}
+        ]
+    },
+    {
+        "proto": {
+            "full_name": " the kitchen sink ",
+            "mtime": {},
+            "left": {},
+            "right": {
+                "nickname": "blub",
+                "right": {},
+                "bar": {
+                    "bar_id": "quux",
+                    "data": [255, 254]
+                }
+            }
+        },
+        "screens": [
+            {"text": "Foo object"},
+            {"text": "Full name:  the kitchen sink ", "indent": 1},
+            {"text": "Mtime: 1970-01-01T00:00:00Z", "indent": 1},
+            {"text": "Left: Foo object", "indent": 1},
+            {"text": "Right: Foo object", "indent": 1},
+            {"text": "Nickname: blub", "indent": 2},
+            {"text": "Right: Foo object", "indent": 2},
+            {"text": "Bar: Bar object", "indent": 2},
+            {"text": "Bar id: quux", "indent": 3},
+            {"text": "Data: FFFE", "indent": 3}
+        ]
+    }
+]

tx/textual/internal/testdata/string.json

@@ -0,0 +1,11 @@
+[
+    {"text": ""},
+    {"text": "x"},
+    {"text": "foo"},
+    {"text": "\"able"},
+    {"text": "unresolved\nambiguities\r\ncost\rbillions"},
+    {"text": "stealth whitespace is significant   "},
+    {"text": "stealth whitespace snailed for your protection  @@"},
+    {"text": "co\u00F6peration"},
+    {"text": "JSON limits unicode to 16 bits, surrogates must be transmitted as-is \uD852\uDF62"}
+]

tx/textual/internal/testpb/1.proto

@@ -39,3 +39,19 @@ message A {
   double         DOUBLE   = 110;
   map<string, A> MAP      = 111;
 }
+
+// Foo is a sample message type used for testing message rendering.
+message Foo {
+  string full_name = 1;
+  string nickname = 2;
+  google.protobuf.Timestamp mtime = 3;
+  Foo left = 4;
+  Foo right = 5;
+  Bar bar = 8;  // skip some field numbers
+}
+
+// Bar is a sample message type used for testing message rendering.
+message Bar {
+  string bar_id = 1;
+  bytes data = 2;
+}