Fix LSP exceptions serializing ResponseErrors with Uris

The ResponseError.data field was typed `dynamic` (as in the LSP spec) but this allows us to accidentally put non-serializable classes in it which will result in server errors when we try to send them back.

This change forces them to Strings and it's up to the code constructing the error to convert any additional data to a string first.

In order to catch this in tests, the mocks now force serialisation of all types flowing from the server to the client (this already happened for client to server).

Change-Id: I5d7f322e1a4296b1479468e36d81daebdbb4ab52
Reviewed-on: https://dart-review.googlesource.com/c/89511
Commit-Queue: Danny Tuppeny <dantup@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
8 files changed
tree: 8a77d01c35d15932a274f7dd1768f4be3f0d3e10
  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. dartdoc_options.yaml
  28. DEPS
  29. LICENSE
  30. PATENTS
  31. PRESUBMIT.py
  32. README.dart-sdk
  33. README.md
  34. WATCHLISTS
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