feat: add Python WebAssembly component support #315
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Add `python_wasm_component` and `python_wasm_binary` rules for building
Python code into WebAssembly components using componentize-py.
## New Rules
- `python_wasm_component`: Build Python into a library component with
custom WIT interface exports
- `python_wasm_binary`: Build Python into a CLI binary component with
wasi:cli/run export
## Toolchain
- Add `componentize_py_toolchain` with hermetic binary downloads
- Add checksums for componentize-py (canary release)
- Integrate with `python_wasm` lazy loading extension
## Example
```starlark
load("@rules_wasm_component//python:defs.bzl", "python_wasm_component")
python_wasm_component(
name = "hello",
srcs = ["app.py"],
wit = "hello.wit",
world = "hello",
)
```
## Lazy Loading
Use `python_wasm` extension for minimal downloads:
```starlark
python_wasm = use_extension("@rules_wasm_component//wasm:language_extensions.bzl", "python_wasm")
python_wasm.configure()
```
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Summary
Add support for building Python code into WebAssembly components using componentize-py.
python_wasm_component: Library component with custom WIT exportspython_wasm_binary: CLI binary withwasi:cli/runexportcomponentize_py_toolchainwith checksum verificationpython_wasmextensionNew Rules
python_wasm_component
python_wasm_binary
Lazy Loading
Test plan
//examples/python_component:hello//examples/python_component:cli_appwasm-tools component wit