Add WorkspacePackage support for InSummarySource sources

An alternative fix to https://dart-review.googlesource.com/c/sdk/+/94356

In this case, `library.source.fullName` results in a String representation
of a library's package: URI. :(

To accomplish this, each *Workspace's contains() method is refactored from
taking a `String path` to taking a `Source source`, so as to use package: URIs
as much as possible, avoiding looking at the filesystem and poking around for
Workspace markers (BUILD, BUILD.gn, WORKSPACE, .jiri-root, etc). This avoids
the issue with InSummarySource sources, which have a non-path `.fullName`, but
have a valid `.uri`.

These issues were found when trying to enforce @sealed internally.

Change-Id: Ia46f28aa7aad0fc4483a180fa47f1e509402da6a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/94985
Commit-Queue: Samuel Rawlins <srawlins@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
12 files changed
tree: 745e9161a06dedbc32c7bbb5a925c39d9c613ccc
  1. .github/
  2. build/
  3. client/
  4. docs/
  5. pkg/
  6. runtime/
  7. samples/
  8. samples-dev/
  9. sdk/
  10. tests/
  11. third_party/
  12. tools/
  13. utils/
  14. .clang-format
  15. .gitattributes
  16. .gitconfig
  17. .gitignore
  18. .gn
  19. .mailmap
  20. .packages
  21. .vpython
  22. AUTHORS
  23. BUILD.gn
  24. CHANGELOG.md
  25. codereview.settings
  26. CONTRIBUTING.md
  27. DEPS
  28. LICENSE
  29. PATENTS
  30. PRESUBMIT.py
  31. README.dart-sdk
  32. README.md
  33. WATCHLISTS
README.md

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