[camerax] Marks all wrapped classes as immutable (#4451)

Marks all Dart-wrapped Android native classes as `@immutable`. They are all immutable anyway because they extend `JavaObject` which is immutable, but marking them as immutable explicitly avoids lint warnings caused by [`must_be_immutable`](https://dart.dev/tools/diagnostic-messages#must_be_immutable) when generated mocks of these classes are used (see https://github.com/dart-lang/mockito/issues/200).

Also, updates `CONTRIBUTING.md` to include marking wrapped classes as immutable and extending `JavaObject` as requirements for adding new wrapped classes.

cc @ChristianEdwardPadilla: this should fix the internal lint errors caused by `JavaObject` being immutable.
46 files changed
tree: 3768297398170423be9f0f3434eb3bc57cdbd4e1
  1. .ci/
  2. .github/
  3. packages/
  4. script/
  5. third_party/
  6. .ci.yaml
  7. .cirrus.yml
  8. .clang-format
  9. .gitattributes
  10. .gitignore
  11. .metadata
  12. analysis_options.yaml
  13. AUTHORS
  14. CODEOWNERS
  15. CONTRIBUTING.md
  16. customer_testing.bat
  17. customer_testing.sh
  18. LICENSE
  19. README.md
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