Export proguard specs from aar_import

**Background**
https://github.com/bazelbuild/bazel/issues/3778

proguard specs from the `aar_import` rule do not get bubbled up to `android_binary`. In this PR, I wire up a `ProguardSpecProvider` from this rule that exports the `proguard.txt` within an AAR if it exists and any transitive proguard specs from the `exports` attribute.

**Changes**
* Add an `aar_embedded_proguard_extractor` script to extract `proguard.txt` from an AAR if it exists otherwise generate an empty proguard specs file
* In AarImport, wire up the proguard extractor action and export results through a `ProguardSpecProvider`.

Once this lands, the android rules would need to be bumped.

**Test Plan**
* Added tests for the extraction python script
* Added tests for the `aar_import` rule changes

Closes #12749.

PiperOrigin-RevId: 359667674
9 files changed
tree: e77b75a7464e509bc527665578acde57a6e419bc
  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. distdir_deps.bzl
  23. ISSUE_TEMPLATE.md
  24. LICENSE
  25. README.md
  26. WORKSPACE
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