Michael Goderbauer 12e586914e Reland "Add deprecations to PlatformMessage stuff" (#42580) (flutter/engine#42929)
This reverts commit 2b5c1f8d95c9c54e51787f5ceaeb142c0666aa72.

This is a straight reland without any additional changes. The package that was still using the outdated API causing the original revert has been updated in https://github.com/flutter/packages/pull/4233. **Do not land this until that PR has rolled into the framework.**
2023-06-20 16:42:25 +00:00
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