Delete wasmtime.loader and wasmtime.bindgen (#310)

* Delete `wasmtime.loader` and `wasmtime.bindgen`

This commit deletes two nice-to-have but difficult-to-maintain modules
in this repository. Specifically:

* The `wasmtime.loader` module is deleted as it was a proof-of-concept
  but doesn't map well to Python and Wasmtime. For example #302 shows
  how destruction of Python modules isn't handled correctly. In general
  it's a "cute" implementation but isn't too too useful and doesn't map
  well to how Wasm is embedded in many contexts. I'm deleting this to
  reduce maintenance burden on this repository. It would be ok to
  reimplement in the future but it would likely require someone with
  more Python knowledge than I.

* The `wasmtime.bindgen` module is deleted in favor of component support
  in #308. This module still makes sense to have but it would need a
  ground-up rewrite to work with component types rather than component
  definitions. This is deferred to future work in #309 and in the
  meantime it's removed to avoid any confusion about what should be used
  and what shouldn't.

Closes #105
Closes #106
Closes #107
Closes #108
Closes #109
Closes #119
Closes #143
Closes #178
Closes #181
Closes #197
Closes #202
Closes #218
Closes #245
Closes #282
Closes #302

* Remove some more metadata

* Remove build-rust build config

Author: alexcrichton

.github/actions/setup/action.yml

@@ -17,35 +17,3 @@ runs:
   # Download precompiled wasmtime binaries for running the project
   - run: python ci/download-wasmtime.py
     shell: bash
-
-  # https://github.com/actions/cache/blob/main/workarounds.md#improving-cache-restore-performance-on-windows-using-cross-os-caching
-  - if: ${{ runner.os == 'Windows' }}
-    name: Use GNU tar
-    shell: cmd
-    run: |
-      echo "Adding GNU tar to PATH"
-      echo C:\Program Files\Git\usr\bin>>"%GITHUB_PATH%"
-
-  # Ensure the Rust lockfile is up-to-date
-  - run: cargo fetch --manifest-path rust/Cargo.toml --locked
-    shell: bash
-
-  # Install the `wasm-tools` binary with the `component` subcommand that is all
-  # that's needed here.
-  - uses: bytecodealliance/actions/wasm-tools/setup@v1
-    with:
-      version: "1.208.1"
-
-  # Build the bindgen wasm blob with some extra Rust targets.
-  - run: |
-      rustup target add wasm32-unknown-unknown wasm32-wasip1
-      echo CARGO_INCREMENTAL=0 >> $GITHUB_ENV
-      echo CARGO_PROFILE_DEV_DEBUG=0 >> $GITHUB_ENV
-      echo RUSTC_VERSION=`rustc --version` >> $GITHUB_ENV
-    shell: bash
-  - uses: actions/cache@v4
-    with:
-      path: rust/target
-      key: rust-target-${{ env.RUSTC_VERSION }}-${{ runner.os }}-${{ hashFiles('rust/Cargo.lock') }}
-  - run: python ci/build-rust.py
-    shell: bash

ci/_custom_build/backend.py

@@ -85,9 +85,5 @@ def build_wheel(wheel_directory, config_settings=None, metadata_directory=None):
         [sys.executable, 'ci/download-wasmtime.py', *download_args],
         check=True,
     )
-    subprocess.run(
-        [sys.executable, 'ci/build-rust.py'],
-        check=True,
-    )
 
     return build_meta_orig.build_wheel(wheel_directory, config_settings, metadata_directory)