Add 'incompatible_default_to_explicit_init_py' flag

This effectively changes the default value of legacy_create_init to false.

Technically, the attribute type has changed from boolean (default true) to tristate (default auto). Therefore, it is possible to see a semantic change in code that introspects a py_binary's or py_test's attrs dict (via native.existing_rules). We think it is unlikely this will break anyone, and in any case it is not currently possible to gate a rule's definition on an incompatible change flag.

Closes #9271. Work toward #7386 and #10076.

RELNOTES: [Python] Added flag --incomaptible_default_to_explicit_init_py to switch the default value of legacy_create_init to True. With this flag enabled, your py_binary and py_test targets will no longer behave as if empty __init__.py files were implicitly littered in your runfiles tree. See [#10076](https://github.com/bazelbuild/bazel/issues/10076).
PiperOrigin-RevId: 276526057
6 files changed
tree: 6742f0ae051925a65ad08cca07a9bf99e26cd863
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEOWNERS
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. CONTRIBUTING.md
  19. CONTRIBUTORS
  20. distdir.bzl
  21. ISSUE_TEMPLATE.md
  22. LICENSE
  23. README.md
  24. WORKSPACE
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