bazel packages: delete NativeProvider, dematerialize StructImpl.provider

This change merges NativeProvider into BuiltinProvider. The two
classes were almost identical.

Also, it removes the StructImpl.provider
field to save one word of space in each instance of NativeInfo.
This requires each subclass to define getProvider,
which is straightforward but leads to a tiresome diff.
(Sadly this doesn't yield tangible space savings; I'm not sure why.)

All the interesting changes are in lib.packages. The rest is repetitive.

This is a small step towards withering StructImpl and StructApi
out of existence.

NO_IFTTT=spurious warning
PiperOrigin-RevId: 341102857
103 files changed
tree: a9cd54ebe4591c7c9431ea101c460d9ec9116abf
  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

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