refactor(whl_library): split out a whl_archive library

[aignas]

Before this PR users would need to download unused dependencies to just extract
the wheels. The minimum list of deps are - packaging and installer for our
whl_installer tool to properly work. This also means that we could not
dogfood our whl_installer tool in the pip-tools implementation.

With this PR we start using whl_archive which just patches, extracts the
wheel and parses METADATA where possible and this is the first step towards
separating how sdists are treated.

Summary:

• refactor: split out whl_archive_impl function for just whls
• refactor: make the implementation of the 'whl_archive' more minimal
• use whl_archive in internal deps
• use a py_library in pip_compile rule.
• remove unused attrs from 'whl_archive'

[aignas]

I thought it would be nice to dogfood the library, but we need to have a reference to the default (or some other) python interpreter in order to do this.

In bzlmod it is possible to do this, but in WORKSPACE it is not, so we may need to leave the deps.bzl as is.