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Lots of Type Annotation and Refactoring

Tom Wiesingrequested to merge
issue/wisski-3548896:3548896-phpstan-6 into 8.x-4.x

This PR gets us about half-way to phpstan level 6. It performs a lot of type annotations and refactoring. Concretely:

  • Lots more functions now have types.
  • There is now a subset of files that can be linted on phpstan level 10 (the highest). This includes some of the main files.
  • Instead of using PbPath arrays directly, this commit introduces utility methods to access them in a type-safe manner.

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