feat: add detector for unused imports

[0xalpharush]

New detector which identifies imported files that are unused.

replaces #1592

@bart1e did a lot of heavy lifting on #1592 and identified many shortcomings that made the detector needlessly difficult to implement, requiring workarounds and bug fixes. The work in #2376 unblocked detecting unused imports in the "straightforward" way.

TODO

• add tests
• need to double check but I think we will miss some unused imports like `import {A, B, C} from "file.sol"; where A is unused but B and C are used. This may be left for future work

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