[pigeon] implements nullable arguments (#895)

* [pigeon] implemented nullable arguements

* implemented dart

* implemented java

* objc implementation

* added generated unit tests

* fixed some objc tests

* added a dart platform test

* added ios platform tests

* added platform test for android

* fixed rebase

* updated pubspec

* stuart feedback

* updated readme

* updated nullability of async nonnull parameters for objc

* updated version to 2.0.0

* stuart feedback
27 files changed
tree: 11ac749f84534bf6522ffc8689c57fe0914db8f2
  1. .ci/
  2. .github/
  3. packages/
  4. script/
  5. third_party/
  6. .ci.yaml
  7. .cirrus.yml
  8. .gitattributes
  9. .gitignore
  10. .metadata
  11. analysis_options.yaml
  14. customer_testing.bat
  15. customer_testing.sh
  17. README.md

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