fix(pypi): fixes to the marker evaluation and utils (#2767) These are just bugfixes to already merged code: * Fix nested bracket parsing in PEP508 marker parser. * Fix the sys_platform constants, which I noticed in #2629 but they got also pointed out in #2766. * Port some of python tests for requirement parsing and improve the implementation. Those tests will be removed in #2629. * Move the platform related code to a separate file. * Rename `pep508_req.bzl` to `pep508_requirement.bzl` to follow the convention. All of the bug fixes have added tests. Work towards #2423.
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