Fixes #1675

…epo (bazel-contrib#1837)

With this change we add support for platform-specific wheel registration
and
doing the selection of which wheel is used at build time.

This supports:
- Different package versions for different platforms.
- Use string_flags to configure what to fetch/select:
    - only whls, only sdist or auto mode.
    - libc version and `musl` vs `glibc` selection.
    - universal2 vs arch wheels for mac.
    - target osx version selection.

Summary of changes:
- The `uv pip install` would only warn the user of yanked packages but
  would not refuse to install them. Update our implementation to better
  match the same behaviour.
- A previous PR has added the support for passing it in the
`requirements_by_platform` and this just add the necessary code to make
  sure that we can also do the dependency management when parsing the
  `whl` `METADATA` files.
- Only configure `dev_pip` deps for `linux` and `osx` platforms to not
raise
  issues later.
- Add a function for generating a `whl_library` name from a `filename`.
- Add a macro for generating all config settings for a particular set of
parameters.
- Update `render_pkg_aliases` to also use those config settings.
- Update the toolchain selection `target_settings` to use the
`py_linux_libc`
config setting. With this the user can register a `musl` linux toolchain
if
  needed. We can also use similar `flag_values` to resolve bazel-contrib#1876.
- Integrate everything in the `pip` extension and setup cross-platform
  select statements.

Work towards bazel-contrib#1357, bazel-contrib#260

Stacked on bazel-contrib#1937