[pigeon] Don't wrap non-nullable primitives in Obj-C (#5214)

Updates the Objective-C generator to use `BOOL`, `NSInteger`, and `double` for non-nullable versions of those primitives, instead of boxing them with `NSNumber*`. This makes the code more idiomatic, brings them into alignment with enum behavior, and importantly helps minimize the chances of clients having issues with silent conversion of `NSNumber*` to `BOOL` in the long term (although it may cause some such issues in the short term when people update; the changelog contains a prominent warning about this).

As an incidental fix, this also fixes the use of `strong` for collections and strings, which is not best practice, since I was already changing related code.

Fixes https://github.com/flutter/flutter/issues/116680
Fixes https://github.com/flutter/flutter/issues/127401
20 files changed
tree: 98ad52c0f5bdeeb6f730ee022d0be18ceb54c6fa
  1. .ci/
  2. .github/
  3. packages/
  4. script/
  5. third_party/
  6. .ci.yaml
  7. .clang-format
  8. .gitattributes
  9. .gitignore
  10. .metadata
  11. analysis_options.yaml
  12. AUTHORS
  13. CODEOWNERS
  14. CONTRIBUTING.md
  15. customer_testing.bat
  16. customer_testing.sh
  17. LICENSE
  18. README.md
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