Fixing Java field access

[oxisto]

This PR consists of a major overhaul of Java reference and member expression parsing. It removes a LOT of old weird legacy code that was full of weird things.

It also introduces a new Java-specific pass, that takes care of deciding when a member access is actually static or not. This might be something that we could decide to adapt for other/all languages (maybe also tied to the discussion in #1863).

[oxisto]

Blocked by #1586

[codecov]

Codecov Report

Attention: Patch coverage is 86.53846% with 7 lines in your changes missing coverage. Please review.

Project coverage is 77.12%. Comparing base (0fea809) to head (dcf7e97).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...in/de/fraunhofer/aisec/cpg/passes/JavaExtraPass.kt	70.58%	0 Missing and 5 partials ⚠️
...raunhofer/aisec/cpg/frontends/java/JavaLanguage.kt	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
...n/de/fraunhofer/aisec/cpg/passes/SymbolResolver.kt	87.85% <ø> (+1.34%)	⬆️
...s/kotlin/de/fraunhofer/aisec/cpg/test/TestUtils.kt	71.27% <ø> (ø)
...ofer/aisec/cpg/frontends/java/ExpressionHandler.kt	77.90% <100.00%> (+4.79%)	⬆️
...aisec/cpg/frontends/java/JavaCallResolverHelper.kt	44.44% <ø> (ø)
...r/aisec/cpg/frontends/java/JavaLanguageFrontend.kt	70.46% <100.00%> (-4.22%)	⬇️
...raunhofer/aisec/cpg/frontends/java/JavaLanguage.kt	84.09% <60.00%> (-3.09%)	⬇️
...in/de/fraunhofer/aisec/cpg/passes/JavaExtraPass.kt	70.58% <70.58%> (ø)

... and 2 files with indirect coverage changes

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[KuechA]

I fail to understand most of the changes since the old code is hard to understand and the new code requires in-depth knowledge and understanding of the java parser and frontend which I do not have. However, I have some nits which should already be resolved and may support subsequent more detailed reviews.

[oxisto]

I fail to understand most of the changes since the old code is hard to understand and the new code requires in-depth knowledge and understanding of the java parser and frontend which I do not have. However, I have some nits which should already be resolved and may support subsequent more detailed reviews.

Agreed. I will extract the remaining changes that are not Java-specific to extra PRs (#1908 and #1909)

[oxisto]

I fail to understand most of the changes since the old code is hard to understand and the new code requires in-depth knowledge and understanding of the java parser and frontend which I do not have. However, I have some nits which should already be resolved and may support subsequent more detailed reviews.

Please re-check, I addressed the issues.