Refactor some py_runtime code

Moved its configured target factory, provider, and test to the ...lib/rules/python directory instead of ...lib/bazel/rules/python. Simplified the test. Also moved BazelPythonConfigurationTest into the bazel dir.

The `files` attribute of py_runtime is no longer mandatory. Since a non-empty value is not permitted when `interpreter_path` is used, it makes more sense to omit it rather than explicitly set it to empty.

The error messages and rule logic are simplified. The provider now has an invariant that either interpreter is null or else interpreterPath and files are null; this will be clarified in a follow-up CL that exposes PyRuntimeProvider to Starlark.

Work toward #7375.

PiperOrigin-RevId: 234174755
12 files changed
tree: bf88a7c1c283592f4288e7d1520bcf9803eaa5fe
  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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