Start with python match statement

[KuechA]

This PR adds the basic comparisons which can be found in python's match statement. The statement is modeled as a SwitchStatement and the main issue are the CaseStatements which offer a wide range of checks, some of which we cannot model trivially.

[codecov]

Codecov Report

Attention: Patch coverage is 86.81319% with 12 lines in your changes missing coverage. Please review.

Project coverage is 76.19%. Comparing base (37987af) to head (947ad17).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...fer/aisec/cpg/frontends/python/StatementHandler.kt	84.72%	6 Missing and 5 partials ⚠️
...er/aisec/cpg/frontends/python/ExpressionHandler.kt	94.44%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
...ofer/aisec/cpg/graph/statements/SwitchStatement.kt	72.00% <ø> (ø)
...de/fraunhofer/aisec/cpg/frontends/python/Python.kt	83.38% <100.00%> (+8.77%)	⬆️
...er/aisec/cpg/frontends/python/ExpressionHandler.kt	75.27% <94.44%> (+0.18%)	⬆️
...fer/aisec/cpg/frontends/python/StatementHandler.kt	84.61% <84.72%> (+0.55%)	⬆️

... and 1 file with indirect coverage changes

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[maximiliankaul]

Overall, I like this very much.
Some more nitpicking comments, but I think this is good to be merged :)
We should open an issue to track the not implemented cases...