package:build_runner v2.5.0

User-visible changes:

• Improved performance for large builds. More performance improvements
  will follow, if your workflow is affected by slow build_runner performance
  then please consider sharing details at
  https://github.com/dart-lang/build/discussions.
• Improved logging: show what builders are running and, for long-running
  builders, where the time is spent.

Versions:

• Bump the min SDK to 3.7.0.
• Use build_test 3.0.0.
• Use build_runner_core 9.0.0.

Internal changes:

• Start using `package:build/src/internal.dart'.
• Refactor MultiPackageAssetReader to internal AssetFinder.
• FinalizedReader no longer implements AssetReader.
• Refactor CachingAssetReader to FilesystemCache.
• Refactor FileBasedAssetReader and FileBasedAssetWriter to ReaderWriter.
• Remove OnDeleteWriter, add functionality to ReaderWriter.
• Add NodeType to AssetNode, remove subtypes. Make mutations explicit.
• Use built_value for AssetNode and related types.
• Add details of what changed and what is built to --verbose logging.
• Compute outputs as needed instead of storing them in the asset graph.
• Refactor invalidation to track current build progress in Build instead of
  in the asset graph.
• Remove completeBuild from RunnerAssetWriter as it's no longer needed.