bazel syntax: make @Skylark-annotated classes implement SkylarkValue

This CL adds a check to the @SkylarkCallable annotation processor to require
that all SkylarkModule- or SkylarkGlobalLibary-annotated classes implement
SkylarkValue, thus ensuring that all Starlark values besides str/int/bool
satisfy this interface.

Future changes will add assertions at the public API (e.g. StarlarkList.add)
that Object values conform to this requirement.

All changes except to .../main/.../{skylarkinterface,syntax}/* are mechanical.

PiperOrigin-RevId: 278876512
119 files changed
tree: a717ef2ef5866f0e8fdffa33ec932a4b6dfd7767
  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
README.md

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