add component-model-async/fused.wast test

This is another piece of #9582 which I'm splitting out to make review easier.

This test exercises fused adapter generation for various flavors of
intercomponent async->async, async->sync, and sync->async calls.

The remaining changes fill in some TODOs to make the test pass.

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

address review feedback

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

update `task.return` to match spec

This temporarily switches to my fork of `wasm-tools` until
bytecodealliance/wasm-tools#1989 is merged.

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

refactor `component-model-async` cfg attrs per review feedback

Also, switch to upstream `wasm-tools` main branch.

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

add `Compiler::new` constructor

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

add comments covering various lower/lift combos in FACT generator

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

add `Compiler::global_set` helper function

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

Author: dicej

Cargo.lock

@@ -565,3 +565,18 @@ opt-level = 's'
 inherits = "release"
 codegen-units = 1
 lto = true
+
+# TODO: Remove these patches once wasm-tools 1.225 is available:
+[patch.crates-io]
+wasmparser = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wasm-metadata = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wat = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wast = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wasmprinter = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wasm-encoder = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wasm-smith = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wasm-mutate = { 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-wave = { git = "https://github.com/bytecodealliance/wasm-tools" }
+