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 80.10753% with 37 lines in your changes missing coverage. Please review.

Project coverage is 78.11%. Comparing base (3236e15) to head (437f9d8).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ec/cpg/helpers/functional/BasicLatticesRedesign.kt	79.88%	30 Missing and 6 partials ⚠️
...lin/de/fraunhofer/aisec/cpg/helpers/IdentitySet.kt	85.71%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
.../fraunhofer/aisec/cpg/passes/UnreachableEOGPass.kt	89.47% <ø> (ø)
...lin/de/fraunhofer/aisec/cpg/helpers/IdentitySet.kt	95.12% <85.71%> (+7.02%)	⬆️
...ec/cpg/helpers/functional/BasicLatticesRedesign.kt	79.88% <79.88%> (ø)

... and 1 file with indirect coverage changes

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[oxisto]

I like it. Some smaller documentation issues and maybe we can avoid some of the result order comparisons.