Merge #6287

6287: Don't replace entire module and file nodes when inserting imports r=matklad a=Veykril

This change minifies the resulting diff of import insertions by inserting or replacing the produced use tree directly through an `action` return value instead replacing the entire container node. This action has to be applied by the caller now. This unfortunately pulls the `AssistBuilder` into scope of `insert_use` back again but I tried to at least keep it away from the `insert_use` fn itself.

I'm open to more/better ideas regarding this :)

Fixes #6196

Co-authored-by: Lukas Wirth <[email protected]>

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