Make Python rules properly read the `imports` field of PyInfo

This makes the built-in Python rules actually accept import paths passed in through the `imports` field of PyInfo (or the deprecated legacy "py" provider). Previously, this field was treated as write-only by the rules.

This is also a code simplification: We get to delete PythonImportsProvider and simplify the dataflow around the imports field of PyCommon.

Fixes #7054.

RELNOTES: None
PiperOrigin-RevId: 233635004
9 files changed
tree: 402c60c7025b63042f588e5787a8a773794aa37e
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. BUILD
  12. CHANGELOG.md
  13. CODEOWNERS
  14. combine_distfiles.py
  15. combine_distfiles_to_tar.sh
  16. compile.sh
  17. CONTRIBUTING.md
  18. CONTRIBUTORS
  19. distdir.bzl
  20. ISSUE_TEMPLATE.md
  21. LICENSE
  22. README.md
  23. WORKSPACE
README.md

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