Remove wit-bindgen-gen-host-wasmtime-py (#436)

This commit removes the host Python generation from this project. The
support here has all moved upstream to
https://github.com/bytecodealliance/wasmtime-py and is now supported
through:

    python -m wasmtime.bindgen my-component.wasm --out-dir ./my-component

Some documentation is in the upstream `README.md` about how to use.
Necessary tests have been mirrored to the upstream repository to the
best of my ability, and this is intended to represent an inflection
point where the growth of the Python generator is no longer tied up with
all the other languages in this repository. This is a step further along
the path of #395.

.github/workflows/main.yml

@@ -52,14 +52,10 @@ jobs:
     - name: Install NPM packages
       run: npm install
       working-directory: crates/gen-host-js
-    - uses: actions/setup-python@v1
-      with:
-        python-version: 3.9
     - uses: actions/setup-java@v3
       with:
         java-version: '18'
         distribution: 'adopt'
-    - run: pip install mypy wasmtime
     - if: matrix.mode == 'release'
       name: Test release build
       run: cargo test --workspace --release

Cargo.toml

@@ -37,7 +37,6 @@ wit-bindgen-gen-guest-c = { path = 'crates/gen-guest-c', version = '0.3.0' }
 wit-bindgen-gen-guest-rust = { path = "crates/gen-guest-rust", version = "0.3.0" }
 wit-bindgen-gen-guest-teavm-java = { path = 'crates/gen-guest-teavm-java', version = '0.3.0' }
 wit-bindgen-gen-host-js = { path = 'crates/gen-host-js', version = '0.3.0' }
-wit-bindgen-gen-host-wasmtime-py = { path = 'crates/gen-host-wasmtime-py', version = '0.3.0' }
 wit-bindgen-gen-host-wasmtime-rust = { path = 'crates/gen-host-wasmtime-rust', version = '0.3.0' }
 wit-bindgen-gen-markdown = { path = 'crates/gen-markdown', version = '0.3.0' }
 wit-bindgen-gen-rust-lib = { path = 'crates/gen-rust-lib', version = '0.3.0' }
@@ -57,7 +56,6 @@ clap = { workspace = true }
 wit-bindgen-core = { path = 'crates/bindgen-core' }
 wit-bindgen-gen-guest-rust = { path = 'crates/gen-guest-rust', features = ['clap'] }
 wit-bindgen-gen-host-wasmtime-rust = { path = 'crates/gen-host-wasmtime-rust', features = ['clap'] }
-wit-bindgen-gen-host-wasmtime-py = { path = 'crates/gen-host-wasmtime-py', features = ['clap'] }
 wit-bindgen-gen-host-js = { path = 'crates/gen-host-js', features = ['clap'] }
 wit-bindgen-gen-guest-c = { path = 'crates/gen-guest-c', features = ['clap'] }
 wit-bindgen-gen-markdown = { path = 'crates/gen-markdown', features = ['clap'] }