Replace UnaryOperator("throw") with ThrowStatement for CXX

[KuechA]

Replaces the usage of UnaryOperator with operatorCode "throw" with the new node ThrowStatement for the CXX-frontend. We have to change the class ThrowStatement to inherit from Expression since this is required in cxx (for the handler, so probably also by the language). This means that we also rename ThrowStatement to ThrowExpression.

[codecov]

Codecov Report

Attention: Patch coverage is 95.65217% with 1 line in your changes missing coverage. Please review.

Project coverage is 75.23%. Comparing base (c516e81) to head (4b3690c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...de/fraunhofer/aisec/cpg/graph/ExpressionBuilder.kt	83.33%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
...kotlin/de/fraunhofer/aisec/cpg/graph/Extensions.kt	73.60% <ø> (ø)
.../de/fraunhofer/aisec/cpg/graph/StatementBuilder.kt	72.86% <ø> (-0.47%)	⬇️
...in/de/fraunhofer/aisec/cpg/graph/builder/Fluent.kt	86.48% <100.00%> (ø)
...ofer/aisec/cpg/graph/statements/ThrowExpression.kt	75.86% <100.00%> (ø)
...n/kotlin/de/fraunhofer/aisec/cpg/passes/DFGPass.kt	83.24% <100.00%> (ø)
...hofer/aisec/cpg/passes/EvaluationOrderGraphPass.kt	89.30% <100.00%> (-0.33%)	⬇️
...hofer/aisec/cpg/frontends/cxx/ExpressionHandler.kt	71.80% <100.00%> (ø)
...hofer/aisec/cpg/frontends/java/StatementHandler.kt	77.36% <100.00%> (ø)
...hofer/aisec/cpg/frontends/llvm/StatementHandler.kt	62.99% <100.00%> (ø)
...de/fraunhofer/aisec/cpg/passes/CompressLLVMPass.kt	65.74% <100.00%> (ø)
... and 2 more

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