This is to ensure that we can represent select of lists in a better way

Before this change, the dependency closures would be influenced by the
host-python interpreter, this removes the influence by detecting the
platforms against which the `Requires-Dist` wheel metadata is evaluated.
This functionality can be enabled via `target_platforms` attribute to
the `pip.parse` extension and is showcased in the `bzlmod` example. The
same attribute is also supported on the legacy `pip_parse` repository
rule.

The detection works in the following way:
- Check if the python wheel is platform specific or cross-platform
  (i.e., ends with `any.whl`), if it is then platform-specific
  dependencies are generated, which will go through a `select`
  statement.
- If it is platform specific, then parse the platform_tag and evaluate
  the `Requires-Dist` markers assuming the target platform rather than
  the host platform.

NOTE: The `whl` `METADATA` is now being parsed using the `packaging`
Python package instead of `pkg_resources` from `setuptools`.

Fixes bazelbuild#1591

Co-authored-by: Richard Levasseur <richardlev@gmail.com>