Temporarily add the Dart model team as owners of pkg/analyzer/api.txt

This should help speed up the review process during the process of
migrating to the new element model API.

Change-Id: I7d2f974df351c6b82dc0d315f2f4bf547704674e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/414825
Commit-Queue: Paul Berry <[email protected]>
Reviewed-by: Konstantin Shcheglov <[email protected]>
Auto-Submit: Paul Berry <[email protected]>

Author: stereotype441

pkg/analyzer/OWNERS

@@ -5,6 +5,7 @@ file:/tools/OWNERS_MODEL
 # reviewed by the developer experience team.
 per-file api.txt=set noparent
 per-file api.txt=file:/tools/OWNERS_DEVELOPER_EXPERIENCE
+per-file api.txt=file:/tools/OWNERS_MODEL
 per-file api.txt=file:/OWNERS # (For last resort global approvers)
 
 # messages.yaml contains error message text, so it should be