Fixes seqfish reader v2

[LucaMarconato]

Additional fixes to support the seqFISH v2 file format.

Changelog

• improved parsing of OME XML metadata
• automatically parsing images as multiscale when they are larger than a threshold
• allowing arbitrary strings as ROIs prefixes
• now representing different ROIs in different coordinate systems
• parsing z coordinate for points
• fixed bug with indices of shapes when multiple rois were considered

CC @LLehner @adamdingliang

[LucaMarconato]

I'm going through old stale PRs. Fixed the conflicts and merging now! CC @adamdingliang

[codecov-commenter]

Codecov Report

❌ Patch coverage is 82.53968% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.30%. Comparing base (26fb99b) to head (6592674).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
src/spatialdata_io/readers/seqfish.py	81.96%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #268      +/-   ##
==========================================
+ Coverage   55.07%   55.30%   +0.23%     
==========================================
  Files          26       26              
  Lines        2809     2846      +37     
==========================================
+ Hits         1547     1574      +27     
- Misses       1262     1272      +10     

Files with missing lines	Coverage Δ
src/spatialdata_io/_constants/_constants.py	100.00% <100.00%> (ø)
src/spatialdata_io/readers/_utils/_utils.py	31.46% <100.00%> (+0.77%)	⬆️
src/spatialdata_io/readers/seqfish.py	89.28% <81.96%> (-5.82%)	⬇️

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