Update Wasmtime for upcoming WIT changes (#6390)

* Update Wasmtime for upcoming WIT changes

This PR integrates bytecodealliance/wasm-tools#1027 into Wasmtime. The
main changes here are:

* WIT syntax is updated with WebAssembly/component-model#193
* Generated bindings in the `bindgen!` macro have been updated to
  reflect the new structure of WIT.
* The accepted component model binary format has been updated to account
  for changes.

This PR disables wasi-http tests and the on-by-default feature because
the WIT syntax has been updated but the submodule containing the WITs
has not been updated yet so there's no way to get that building
temporarily. Once that's updated then this can be reenabled.

* Update wasmtime-wasi crate with new WIT

* Add wit-bindgen override for the updated version

* Officially disable wasi-http tests/building

* Move test-reactor WIT into the main WIT files

Don't store duplicates with the rest of the WASI WIT files we have.

* Remove adapter's copy of WIT files

* Disable default features for wit-bindgen

* Plumb disabling wasi-http tests a bit more

* Fix reactor tests and adapter build

* Remove no-longer-needed feature

* Update adapter verification script

* Back out some wasi-http hacks

* Update vet and some dependency sources

* Move where wit-bindgen comes from

Make it a more "official" location which is also less likely to be
accidentally deleted in the future.

* Don't document wasi-http-tests

.github/workflows/main.yml

@@ -222,6 +222,7 @@ jobs:
  cargo doc --no-deps --workspace \
  --exclude wasmtime-cli \
  --exclude test-programs \
+ --exclude wasi-http-tests \
  --exclude cranelift-codegen-meta \
  --features component-model
  - run: cargo doc --package cranelift-codegen-meta --document-private-items