Add flag for getting the Python runtime from the toolchain

This adds --experimental_use_python_toolchains (to be renamed --incompatible...). When enabled, py_binary and py_test will obtain the Python runtime from the resolved Python toolchain, rather than from the legacy mechanism (--python_top / --python_path).

Work toward #7375.

RELNOTES: None
PiperOrigin-RevId: 237131032
11 files changed
tree: 3ebc9ba080197c44bbe5390ab8d83725aeb0a84c
  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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