feat(bindings-ts)!: require configuring network settings (stellar#852)

* feat(bindings-ts)!: require configuring network settings

Generated libraries now export a `Contract` class that needs to be
instantiated by the user with RPC URL, Network Passphrase, and contract
ID.

* feat(bindings-ts): add test config for generated fixtures

* feat: test drive error-parsing in client libs

this logic was totally broken! thanks for showing us, tests.

* chore: add failing custom type test

* chore: demonstrate complex enum shortcomings

you can see here that

- the input needs the `as const`
- but to make that work for complex types, a `readonly` is needed in the
  typing

additionally, the input and output are typed differently:

- the input needs to be wrapped in an array
- the output does not

also, for enums that do not have `values`, you still need to specify
`values: undefined`

* chore: demonstrate many struct encoding problems

* chore: demonstrate many struct encoding problems

* feat: no more need for `Method` suffix

When we exported functions for each method, we needed to make sure we
only used safe JS words. This no longer matters, since they're exposed
as methods on the `Contract` class.

Since this change required rebuilding the snapshot, I also made sure the
`readonly` settings were added to the source, rather than manually to
the snapshot.

* chore: finish testing all custom_type methods

* chore: remove placeholder signing machinery

* feat: add `networks` export to generated library

* chore: update generated README

* chore: fix formatting of generated file

* build: appease clippy

* docs: remove outdated '--name' from example

* docs: fix example in doc comment

Re: https://typedoc.org/tags/example/, it is best to use both `@example`
and the triple-backtick code block

* build: update snapshot build command

* docs: improve method-options TSDoc

---------

Co-authored-by: Willem Wyndham <willem@ahalabs.dev>

Makefile

@@ -103,10 +103,10 @@ lint:
 typescript-bindings-fixtures: build-test-wasms
 	cargo run -- contract bindings typescript \
 					--wasm ./target/wasm32-unknown-unknown/test-wasms/test_custom_types.wasm \
-					--contract-name test_custom_types \
-					--contract-id CA3D5KRYM6CB7OWQ6TWYRR3Z4T7GNZLKERYNZGGA5SOAOPIFY6YQGAXE \
+					--contract-id CB5T6MLZNWJBUBKEQAUVIG5JJWKYSYVVE2OVN25GMX3VX7CZ7OBAPAU4 \
 					--network futurenet \
-					--output-dir ./cmd/crates/soroban-spec-typescript/fixtures
+					--output-dir ./cmd/crates/soroban-spec-typescript/fixtures/test_custom_types \
+					--overwrite
 
 
 # PHONY lists all the targets that aren't file names, so that make would skip the timestamp based check.