Platform implementation portion of https://github.com/flutter/packages/pull/3882 Updates the Windows implementation to use the new base class for camera delegation, and creates new macOS and Linux implementations that are near-duplicates. These are separate packages, rather than a single shared package, because it's likely that they will diverge over time (e.g., the TODO for macOS to use a system image picker control on newer versions of macOS), and the amount of code that could be shared is minimal anyway. Part of https://github.com/flutter/flutter/issues/102115 Part of https://github.com/flutter/flutter/issues/102320 Part of https://github.com/flutter/flutter/issues/85100
Merges in: - test exclusion configs - AUTHORS - CODEOWNERS - Dependabot configs - autolabel configs Merge exclusions Merge CODEOWNERS
* Add placeholder exclusion files * Add exclusion refs to LUCI, update a task name * Adjust test plugin podspecs to avoid warnings * Add podspec check to CI * Add drive step for Windows * Sync .ci.yaml * Add placeholder yaml for repo tool test
