Moves the following classes from
`package:analyzer/analysis_rule/analysis_rule.dart` into
`package:analyzer/src/analysis_rule/analysis_rule.dart`:
- `AbstractAnalysisRule`
- `AnalysisRule`
- `MultiAnalysisRule`
- `RemovedAnalysisRule`
These classes are part of the analyzer public API, so the file
`package:analyzer/analysis_rule/analysis_rule.dart` remains, exporting
the declarations so that they can still be used by clients.
This paves the way for a follow-up CL that will use extensions to add
functionality that we *don't* want to include in the analyzer public
API yet.
Change-Id: I6a6a696431f00f69b4b80e0d98b1b8fbb33f020f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/481164
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Commit-Queue: Paul Berry <paulberry@google.com>
Paul Berry
dfd26d463c