[analysis_server] Refactor LSP code actions handling This is mostly* a no-op refactor. This code handler had grown quite messy and all of the quick-fixes code only ran for Dart files (and assumed it had a resolved unit) which complicates fixing https://github.com/dart-lang/sdk/issues/50306 (quick-fixes for non-Dart files). This change splits the handling into separate classes for each source of code actions (currently just "server Dart" and "plugins" but soon there will be pubspec/analysis_options producers too), then merges each group and sorts that group by priority. * the one minor change is a code-path that was producing CodeAction literals where the client had not advertised supported this. This is now fixed and the related test updated. Change-Id: I8837610c64aba3f2c3dcb2f1eb0bc9bf5c43ad62 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/271360 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>
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