Simplified and more basic fixpoint iteration

[KuechA]

The current fix-point iteration system is a bit tricky to understand and hard to debug. I'd try to remove some of the bloat and simplify it. In particular, it should keep less states (i.e., save memory, remove a bunch of indirections) and copy objects instead of manipulating them (which should make it easier to understand things).

[codecov]

Codecov Report

Attention: Patch coverage is 74.50980% with 26 lines in your changes missing coverage. Please review.

Project coverage is 75.08%. Comparing base (47d6f94) to head (6659888).

Files with missing lines	Patch %	Lines
...nhofer/aisec/cpg/helpers/functional/EOGWorklist.kt	0.00%	20 Missing ⚠️
...ofer/aisec/cpg/helpers/functional/BasicLattices.kt	92.68%	5 Missing and 1 partial ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
.../fraunhofer/aisec/cpg/passes/UnreachableEOGPass.kt	87.93% <ø> (ø)
...ofer/aisec/cpg/helpers/functional/BasicLattices.kt	92.68% <92.68%> (ø)
...nhofer/aisec/cpg/helpers/functional/EOGWorklist.kt	0.00% <0.00%> (ø)

... and 4 files with indirect coverage changes

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