Add symlink support to ZipFilesystem

[Schamper]

This might fix #699 (@Zawadidone could you confirm?) and probably makes #793 redundant (sorry 😅).

This also reworks the internals of the ZipFilesystem a little bit.

[codecov]

Codecov Report

Attention: Patch coverage is 87.93103% with 7 lines in your changes missing coverage. Please review.

Project coverage is 75.56%. Comparing base (789009d) to head (e5cb3f5).

Files	Patch %	Lines
dissect/target/filesystems/zip.py	87.93%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #808      +/-   ##
==========================================
+ Coverage   75.53%   75.56%   +0.02%     
==========================================
  Files         299      299              
  Lines       25744    25782      +38     
==========================================
+ Hits        19445    19481      +36     
- Misses       6299     6301       +2     

Flag	Coverage Δ
unittests	75.56% <87.93%> (+0.02%)	⬆️

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[Zawadidone]

Thanks it fixes #699!