refactor(pypi): translate wheel METADATA parsing to starlark (#2629) This PR starts using the newly introduced (#2692) PEP508 compliant requirement marker parser in starlark and moves the dependency generation from the Python language (`whl_installer`) to the Starlark in the `whl_library` repository rule. This PR is (almost) a pure refactor where no bugs are fixed, but this is foundational work that also adds notes on how things will be moved to macros (i.e. analysis phase) so that we can fix a few long standing bugs and prepare for stabilizing the `experimental_index_url` (#260). Refactor: * I have migrated all of the unit tests from Python to starlark for deps generation from METADATA `Requires-Dist` fields. * Read the `METADATA` file itself in Starlark. Work towards #260, #2319, #2241 Fixes #2423
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