Migrate swift module map to its own action (take 2)

This is in preparation for enabling layering check for `objc_library`.

Layering check requires that a module map be generated.  Currently,
`objc_library` generates a module map to be used by `swift_library`.
The two module maps are incompatible, so we migrate the swift one to
its own action, freein

Eventually, the module map needed by `swift_library` will be migrated
to `swift_library`.

I also had to switch `objc_import` so that it "compiles" its header
and generates a module map.  An external visible effect, however, is
that `objc_import` will now have a `deps` attribute.

PiperOrigin-RevId: 363185731
6 files changed
tree: 68389565c67efd845ac9370163ba33412e4b1deb
  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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