bazel packages: decentralize StarlarkSemantics

Prior to this change, StarlarkSemantics was a closed set of options,
which meant that it had to enumerate all the optional key/value features
of its client, Bazel. (This of course makes no sense for other clients
such as Copybara.)

This change turns it into an open and extensible set of key/value pairs.
All the Bazel semantics option have been moved to packages.semantics.BuildLanguageOptions.

This removes the last logical dependency of Starlark on Bazel.

Also:
- fix a few places where the old FlagIdentifier names were inconsistent
  with the actual flag name.
- add a static check that boolean semantics options have a name that
  starts with + or - (to specify the default value).
PiperOrigin-RevId: 330379130
110 files changed
tree: 80aef3d01a26e1087be38676bfdb552b06ee0677
  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. CODEBASE.md
  15. CODEOWNERS
  16. combine_distfiles.py
  17. combine_distfiles_to_tar.sh
  18. compile.sh
  19. CONTRIBUTING.md
  20. CONTRIBUTORS
  21. distdir.bzl
  22. ISSUE_TEMPLATE.md
  23. LICENSE
  24. README.md
  25. WORKSPACE
README.md

Bazel

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See CONTRIBUTING.md

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