Acessing `ResolvedLibraryResult` inside `MultiCorrectionProducer`

[FMorschel]

For https://dart-review.googlesource.com/c/sdk/+/386020 (#56830), I need access to ResolvedLibraryResult for walking up the part files and getting all ImportDirectives. Similar to what was done for Go to Import at https://dart-review.googlesource.com/c/sdk/+/394200.

I'll open a Cl for adding this to MultiCorrectionProducer and link it here.

[dart-github-bot]

Summary: The user needs access to ResolvedLibraryResult within MultiCorrectionProducer to walk up part files and retrieve all ImportDirectives, similar to the implementation in Go to Import. They will create a CL to add this functionality and link it to the issue.

[FMorschel]

https://dart-review.googlesource.com/c/sdk/+/395420

[FMorschel]

I've added you, @bwilkerson, as a reviewer there, can you please review this? There are lots of files on this CL with small changes but this weekend I had to fix merge conflicts twice on the same day already 😅 (because of the big file count). scheglov has already guided me through this change, reviewed everything and approved it. Thanks for your time!