Add PoC/example pure uring based UDP client and server

These are not fully featured and are basically the bare minimum to get a
working pair of UDP client and server.

By building a pure I/O based event loop the hope was to cut out all the
overhead relating to the use of async and make it possible to focus purely on
the I/O bottlenecks.

Cargo.toml

@@ -6,6 +6,8 @@ members = [
     "lightway-app-utils",
     "lightway-client",
     "lightway-server",
+    "uring-udp-server",
+    "uring-udp-client",
 ]
 
 resolver = "2"
@@ -14,10 +16,15 @@ resolver = "2"
 lto = true
 debug = 1
 
+[profile.custom]
+inherits = "release"
+lto = false
+
 [workspace.lints.rust]
 unsafe_code = "deny"
 unsafe_op_in_unsafe_fn = "deny"
 unused_unsafe = "deny"
+unused_extern_crates = "deny"
 
 [workspace.lints.clippy]
 missing_safety_doc = "deny"

Earthfile

@@ -40,7 +40,8 @@ source:
     FROM +install-build-dependencies
     COPY --keep-ts Cargo.toml Cargo.lock ./
     COPY --keep-ts deny.toml ./
-    COPY --keep-ts --dir lightway-core lightway-app-utils lightway-client lightway-server .cargo ./
+    COPY --keep-ts --dir lightway-core lightway-app-utils lightway-client lightway-server uring-udp-client uring-udp-server .cargo ./
+    COPY --keep-ts --dir tests/certs ./tests/certs/
 
 # build builds with the Cargo release profile
 build:

uring-udp-client/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "uring-udp-client"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+lightway-core = { workspace = true, features = ["postquantum"] }
+io-uring = "0.6"
+anyhow.workspace = true
+libc.workspace = true
+bytes.workspace = true
+tracing-subscriber.workspace = true
+tracing.workspace = true
+arrayvec = "0.7.6"
+tun2 = "3.1.4"
+pnet.workspace = true
+socket2.workspace = true
+sync-unsafe-cell = "0.1.1"
+
+[lints]
+workspace = true
+