Allow a SpawnRunner to inject output metadata

Split parts of the MetadataHandler interface into the newly
introduced MetadataInjector interface and introduce MetadataInjector#injectRemoteDirectory(...).

All methods that should be exposed to SpawnRunners to set
metadata about action outputs are now available via the
MetadataInjector interface.

In a follow up CL we can clean up some call sides from using
MetadataHandler, which provides access SkyFrame internal methods, to
use MetadataInjector instead.

Progress towards #6862

Closes #7599.

PiperOrigin-RevId: 237818411
13 files changed
tree: 84b15ed3ce45a9ab705152d77c63bd73fdb0b7f9
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. BUILD
  12. CHANGELOG.md
  13. CODEOWNERS
  14. combine_distfiles.py
  15. combine_distfiles_to_tar.sh
  16. compile.sh
  17. CONTRIBUTING.md
  18. CONTRIBUTORS
  19. distdir.bzl
  20. ISSUE_TEMPLATE.md
  21. LICENSE
  22. README.md
  23. WORKSPACE
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