Add `--output=files` mode to cquery (#15979)

With the new output mode `--output=files`, cquery lists all files advertised by the matched targets in the currently requested output groups.

This new mode has the following advantages over `--output=starlark` combined with an appropriate handcrafted `--starlark:expr`:
* provides a canonical answer to the very common "Where are my build outputs?" question
* is more friendly to new users as it doesn't require knowing about providers and non-BUILD dialect Starlark
* takes the value of `--output_groups` into account
* stays as close to the logic for build summaries printed by `bazel build` as possible

Fixes #8739

RELNOTES: `cquery`'s new output mode [`--output=files`](https://bazel.build/docs/cquery#files-output) lists the output files of the targets matching the query. It takes the current value of `--output_groups` into account.

Closes #15552.

PiperOrigin-RevId: 462630629
Change-Id: Ic648f22aa160ee57b476180561b444f08799ebb6
17 files changed
tree: 5cba96d8eb59d91d09bbce725ce8d741567f9cd6
  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. CODE_OF_CONDUCT.md
  15. CODEBASE.md
  16. CODEOWNERS
  17. combine_distfiles.py
  18. combine_distfiles_to_tar.sh
  19. compile.sh
  20. CONTRIBUTING.md
  21. CONTRIBUTORS
  22. distdir.bzl
  23. distdir_deps.bzl
  24. ISSUE_TEMPLATE.md
  25. LICENSE
  26. README.md
  27. SECURITY.md
  28. WORKSPACE
  29. WORKSPACE.bzlmod
README.md

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