Refactor the async execution interface for actions

This makes the interface generic such that it can be used for multiple
steps as well as for multiple concurrently running spawns, effectively
allowing any action subclass to opt-in to the new framework.

The new API is directly equivalent to the old execute method, so we can
subsequently switch to using the new API for all actions, even if
they're still executing synchronous, and then move individual action
types over piecemeal.

Progress on #6394.

PiperOrigin-RevId: 235726176
7 files changed
tree: 4c7bf88b0f3846807d0b43dd3d42a18b2a4299ee
  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
README.md

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