Support imports using importlib.import_module

[lmmx]

Commits:

• test: add coverage for dynamic import with importlib
• feat(WIP): attempt to get importlib imports
• test: add test coverage for both importlib formats
• feat: also handle case where importlib.import_module is aliased
• refactor: consolidate proof of concept test into existing test
• refactor(clippy): collapse nested if let statements in Stmt::Expr match arm
• docs: note which sort of importlib import are supported

PR Checklist

• A description of the changes is added to the description of this PR.
• If there is a related issue, make sure it is linked to this PR.
• If you've fixed a bug or added code that should be tested, add tests!
• If you've added or modified a feature, documentation in docs is updated

Description of changes

• Support for imports given as string literals directly to importlib.import_module
  Dependencies with importlib.import_module are not detected #780

[lmmx]

Added extra tests and made sure it works with all possible ways of aliasing the importlib.import_module import

Ready for review @mkniewallner 😃

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.0%. Comparing base (355292c) to head (cb79798).

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #782   +/-   ##
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  Coverage   93.0%   93.0%           
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  Files         37      37           
  Lines        961     961           
  Branches     173     173           
=====================================
  Hits         894     894           
  Misses        51      51           
  Partials      16      16           

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[lmmx]

Thanks for the review @mkniewallner and @fpgmaas, refactors and nits addressed. I hope these new docstrings are sufficiently clear, but any further feedback welcome 😄

[mkniewallner]

Thanks for the contribution!