WIP! first step: import checking extensions

[maximiliankaul]

Still a lot of problems and discussions we should have:

• someCallExpressionNode.isImported: this should probably return whether the call is imported or not. However, if we think about foo.bar.baz or any other MemberExpression, then the current approach does not work.
• Do we want the end-user to figure out the base of the MemberExpression and be user friendly when providing isImported, or do we make the end-user do all the work and simply provide isImported on Names?
• Only thinking about MemberExpressions is not sufficient. References need to be considered, too.
• As well as C++ using namespace stuff...
• What do other languages do?

(Remember to test nested member expressions, too)

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 76.15%. Comparing base (bf8a497) to head (d678a8c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...kotlin/de/fraunhofer/aisec/cpg/graph/Extensions.kt	50.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
...er/aisec/cpg/frontends/python/ExpressionHandler.kt	75.74% <100.00%> (+0.65%)	⬆️
...kotlin/de/fraunhofer/aisec/cpg/graph/Extensions.kt	62.36% <50.00%> (-0.18%)	⬇️

... and 2 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

---

🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests
• JS Bundle Analysis - Avoid shipping oversized bundles