Packages the distutils stdlib module as a standalone package,
```
377K distutils.data
221K distutils.data.br
19K distutils.js
```
to reduce the minimal pyodide size.

Part of #1542 

This also,
 - adds documentation on what's supported or not in the stdlib
 - makes a few changes to `pyodide_build/buildall.py` to be able to add such stdlib packages as a dependency in other packages (which didn't work before). For instance, until there is a release with https://github.com/pypa/packaging/pull/396 micropip has a dependency on distutils.
Unvendor distutils. Packages the distutils stdlib module as a standalone package,
```
377K distutils.data
221K distutils.data.br
19K distutils.js
```
to reduce the minimal pyodide size.

Part of #1542 

This also,
 - adds documentation on what's supported or not in the stdlib
 - makes a few changes to `pyodide_build/buildall.py` to be able to add such stdlib packages as a dependency in other packages (which didn't work before). For instance, until there is a release with https://github.com/pypa/packaging/pull/396 micropip has a dependency on distutils.
(pyodide-build-cli)=
# pyodide_build CLI

```{eval-rst}
.. sphinx_argparse_cli::
   :module: pyodide_build.__main__
   :func: make_parser
   :prog: bin/pyodide
   :title:
```

(pyodide-build-cli)=
# pyodide_build CLI

```{eval-rst}
.. sphinx_argparse_cli::
   :module: pyodide_build.__main__
   :func: make_parser
   :prog: bin/pyodide
   :title:
```
