bazel packages: simplify NativeInfo

Only one of the 75 subclasses of NativeInfo uses its 'values' map.
This change pushes the map down into the sole user (ToolchainInfo),
saving two words in the NativeInfo object, plus an ImmutableSet of
its field names.

OutputGroupInfo now implements StructImpl directly,
as it has no annotated fields and thus no need for NativeInfo.

Also:
- better doc comments
- remove test of NativeInfo.values functionality.
  CcToolchainInfo test slightly augmented to compensate.
- delete unused ToolchainInfo.create
- make MapBackedSkylarkInfo private
- delete 'implements Serializable'
- delete getImplementationClasses
PiperOrigin-RevId: 284628869
11 files changed
tree: f34220d08cc6bb3227ef5f2732fcf77c18f43eda
  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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