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).

It also contains some adjustments to the import system, more specifically when the importedSymbols field is populated. This might have implications for other languages and if wanted I can extract this into a separate PR.

[oxisto]

Blocked by #1586

[codecov]

Codecov Report

Attention: Patch coverage is 88.52459% with 7 lines in your changes missing coverage. Please review.

Project coverage is 76.30%. Comparing base (d2c7f28) to head (c7f72a6).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...in/de/fraunhofer/aisec/cpg/passes/JavaExtraPass.kt	68.75%	0 Missing and 5 partials ⚠️
...n/de/fraunhofer/aisec/cpg/passes/ImportResolver.kt	83.33%	0 Missing and 2 partials ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
...n/de/fraunhofer/aisec/cpg/passes/SymbolResolver.kt	87.89% <100.00%> (-0.32%)	⬇️
...lin/de/fraunhofer/aisec/cpg/passes/TypeResolver.kt	95.74% <100.00%> (+0.18%)	⬆️
...s/kotlin/de/fraunhofer/aisec/cpg/test/TestUtils.kt	71.87% <ø> (+0.29%)	⬆️
...ofer/aisec/cpg/frontends/java/ExpressionHandler.kt	77.80% <100.00%> (+5.36%)	⬆️
...r/aisec/cpg/frontends/java/JavaLanguageFrontend.kt	68.12% <100.00%> (-3.94%)	⬇️
...n/de/fraunhofer/aisec/cpg/passes/ImportResolver.kt	89.41% <83.33%> (-0.13%)	⬇️
...in/de/fraunhofer/aisec/cpg/passes/JavaExtraPass.kt	68.75% <68.75%> (ø)

... and 9 files with indirect coverage changes

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