update future.{write,read} ABIs

This updates the Rust generator to use the new ABI defined in
WebAssembly/component-model#524.  The C generator will
need a similar update as well.

- `future.write` now accepts its payload value as up to 4 flat parameters before spilling to linear memory.

- `future.read` takes no payload pointer when it has no payload type

- `{stream,future}.close-{readable,writable}` have been renamed to `{stream,future}.drop-{readable,writable}`

I've tested this end-to-end with `wasip3-prototyping` and will soon post a
corresponding PR there.

Finally, `rustfmt` was complaining about using `gen` as a field name, so I took
this opportunity to address that.

Signed-off-by: Joel Dice <[email protected]>

Author: dicej

Cargo.lock

@@ -31,13 +31,13 @@ prettyplease = "0.2.20"
 syn = { version = "2.0.89", features = ["printing"] }
 futures = "0.3.31"
 
-wat = "1.232.0"
-wasmparser = "0.232.0"
-wasm-encoder = "0.232.0"
-wasm-metadata = { version = "0.232.0", default-features = false }
-wit-parser = "0.232.0"
-wit-component = "0.232.0"
-wasm-compose = "0.232.0"
+wat = "1.233.0"
+wasmparser = "0.233.0"
+wasm-encoder = "0.233.0"
+wasm-metadata = { version = "0.233.0", default-features = false }
+wit-parser = "0.233.0"
+wit-component = "0.233.0"
+wasm-compose = "0.233.0"
 
 wit-bindgen-core = { path = 'crates/core', version = '0.42.1' }
 wit-bindgen-c = { path = 'crates/c', version = '0.42.1' }
@@ -83,3 +83,16 @@ csharp = ['dep:wit-bindgen-csharp']
 csharp-mono = ['csharp']
 moonbit = ['dep:wit-bindgen-moonbit']
 async = []
+
+# TODO: remove this once
+# https://github.com/bytecodealliance/wasm-tools/pull/2222 is included in a
+# `wasm-tools` release:
+[patch.crates-io]
+wasmparser = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wat = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wast = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wasm-encoder = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wit-parser = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wit-component = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wasm-compose = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wasm-metadata = { git = "https://github.com/bytecodealliance/wasm-tools" }