Add config() query function support to aquery (resolving #10872)

This change enables the `config(expr, word)` function in `aquery` by:
1. Moving `ConfigFunction` from `cquery` package to `query2` package and generalizing its `eval()` method to work with any `PostAnalysisQueryEnvironment`.
2. Lifting `getConfiguredTargetsForConfigFunction` into `PostAnalysisQueryEnvironment<T>` so that both `cquery` and `aquery` share identical configuration resolution and error reporting.
3. Implementing `getConfiguredTarget(Label, BuildConfigurationValue)` and `getQueryName()` in both `ActionGraphQueryEnvironment` and `ConfiguredTargetQueryEnvironment`.
4. Registering `ConfigFunction` in `ActionGraphQueryEnvironment.AQUERY_FUNCTIONS`.
5. Adding unit tests for `config()` in `ActionGraphQueryTest`.
6. Adding integration tests for `config()` in `aquery_test.sh`.
7. Documenting `config()` in `devtools/blaze/docs_src/aquery.html`.

RELNOTES: Aquery now supports the `config(expr, word)` function.
PiperOrigin-RevId: 971764077
Change-Id: I7ead2ed2da603a228891493d800d8d12921ff3e0
6 files changed
tree: 498a695dfa644b516cb51284e621a8725c53678f
  1. .bazelci/
  2. .devcontainer/
  3. .gemini/
  4. .github/
  5. docs/
  6. examples/
  7. scripts/
  8. site/
  9. src/
  10. third_party/
  11. tools/
  12. .bazelrc
  13. .bazelversion
  14. .gitattributes
  15. .gitignore
  16. AGENTS.md
  17. AUTHORS
  18. bazel_downloader.cfg
  19. BUILD
  20. CHANGELOG.md
  21. CODE_OF_CONDUCT.md
  22. CODEOWNERS
  23. combine_distfiles.py
  24. combine_distfiles_to_tar.sh
  25. compile.sh
  26. CONTRIBUTING.md
  27. CONTRIBUTORS
  28. distdir.bzl
  29. extensions.bzl
  30. LICENSE
  31. maven_install.json
  32. MODULE.bazel
  33. MODULE.bazel.lock
  34. oneversion_allowlist.csv
  35. oneversion_allowlist_for_tests.csv
  36. pyproject.toml
  37. README.md
  38. repositories.bzl
  39. requirements.txt
  40. SECURITY.md
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