Add a new parents_data field in RevisionInfo

The new field is a list of ParentInfo entities and provides more
information about the parent commit of the patch-set.

There are two cases for parent commits:
1) It can be a merged commit in the target branch. We detect this case
   by checking if the parent commit SHA-1 is reachable from the tip of
   the target branch.
2) Otherwise, we assume that the parent commit is a patch-set of another
   gerrit change. We lookup the parent commit SHA-1 in the change index
   to get the change data of the parent.

The new `parents_data` field is not returned in response by default, but
is gated with a List Change Option.

Returning this data on the API is beneficial to provide better
highlights of the parents in the web UI when showing diffs (especially
patchset diffs). The web UI can request CommitInfo for each LHS/RHS
patchsets in the diff.

Note on compatibility: we added a new entity called ParentCommitData in
the entities package, but this entity is not serialized anywhere. It's
only used as an intermediary entity before surfacing the new data on the
API, hence it does not harm.

Change-Id: I9d572e61eed9c8a3937f7e4064f0357323481654
Release-Notes: Add a new parents_data field in RevisionInfo
Forward-Compatible: checked
8 files changed
tree: b9316674354e34dccc88a2b54be1ea7444ecec98
  1. .settings/
  2. .ts-out/
  3. antlr3/
  4. contrib/
  5. Documentation/
  6. e2e-tests/
  7. java/
  8. javatests/
  9. lib/
  10. modules/
  11. plugins/
  12. polygerrit-ui/
  13. prolog/
  14. prologtests/
  15. proto/
  16. resources/
  17. tools/
  18. webapp/
  19. .bazelignore
  20. .bazelproject
  21. .bazelrc
  22. .bazelversion
  23. .editorconfig
  24. .git-blame-ignore-revs
  25. .gitignore
  26. .gitmodules
  27. .gitreview
  28. .mailmap
  29. .pydevproject
  30. .zuul.yaml
  31. BUILD
  32. COPYING
  33. INSTALL
  34. Jenkinsfile
  35. package.json
  36. README.md
  37. SUBMITTING_PATCHES
  38. version.bzl
  39. web-dev-server.config.mjs
  40. WORKSPACE
  41. yarn.lock
README.md

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On Fedora run:

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