sausage-plugin part 2: import! with typed clients (sausage_interface::client_rs), TCP endpoints with rpc.endpoint, examples

Part 1 fixes: complete stdout writes, buffered stdin, Rust type names
in schemas, enum variant docs, -32603 for serde errors in handlers,
crate docs and modules. End-to-end check of a generated consumer through
a fake core.

sdk/Cargo.toml

@@ -6,14 +6,16 @@ description = "SDK for Sausage plugins."
 
 [dependencies]
 sausage-plugin-macros = { version = "0.1", path = "macros" }
-sausage-interface = { path = "../interface" }
+sausage-interface = { path = "../interface", default-features = false }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 schemars = "1"
 futures = "0.3"
+inventory = "0.3"
 
 [target.'cfg(target_os = "wasi")'.dependencies]
 wstd = "0.6"
 
 [dev-dependencies]
+sausage-interface = { path = "../interface", features = ["codegen"] }
 trybuild = "1"