bazel syntax: move Selector{List,Value} into lib.packages

The Bazel 'select' function is no longer in Starlark.UNIVERSE.
It is pre-declared in all Bazel file environments (BUILD, .bzl, WORKSPACE).
This is a new category (though depset belongs in it too),
exposed as StarlarkLibrary.COMMON.

Also:
- make various methods private
- improve the annotation doc comment
- remove legacyNamed for select(x={...}).
  There are no uses in Google's depot.

A later change will merge Selector{List,Value} into a single data
type that represents a node in a binary tree whose branch nodes
are deferred '+' operations and whose leaves are dictionaries.
While removing what looked like unnecessarily qualified class
names, I discovered that BuildType.SelectorList is yet a third (!)
Starlark value class representing the same concept.

PiperOrigin-RevId: 291938455
19 files changed
tree: a8d11bb3cc2f648a79fb582b97e1beae1217e380
  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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