Parse entire macsima metadata from OME metadata

[MSHelm]

Fixes #348

The parser now tries to use the filename stored in the tiff metadata, if it exists. This is more robust, as users typically do not modify these entries.
If this metadata doesnt exist (which is the case for older data), it falls back to the actual filename.

Since the lung dataset used for testing is using an old format, I added a newer data set that is publicy available (https://zenodo.org/records/14008816). I documented this in the tests as well.

Full disclosure: I am working for Miltenyi, but I love your work ;)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 12.29050% with 157 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.09%. Comparing base (301650e) to head (cef7170).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
src/spatialdata_io/readers/macsima.py	12.29%	157 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (301650e) and HEAD (cef7170). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (301650e)	HEAD (cef7170)
	3	2

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #349       +/-   ##
===========================================
- Coverage   55.20%   36.09%   -19.11%     
===========================================
  Files          26       26               
  Lines        2806     2970      +164     
===========================================
- Hits         1549     1072      -477     
- Misses       1257     1898      +641     

Files with missing lines	Coverage Δ
src/spatialdata_io/readers/macsima.py	21.19% <12.29%> (-7.38%)	⬇️

... and 7 files with indirect coverage changes

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[MSHelm]

I checked the tests and the failing ones are all due to some Xenium and Visium HD readers, which I didnt touch XD Did they exist before this PR already?

[MSHelm]

Hey everyone,
with the last commits this turned into a bit of a bigger contribution. With this PR, we now solely rely on the metadata stored in the OME object. This should be significantly more robust than parsing file names, and enables us to add more metadata. In principle there would be even more information available than I currently implemented, but I think the most interesting bits are covered here.

I implemented 2 versions of the parser, as there are 2 different formats of the metadata. I removed the previously used data sets, as they are not part of the CI. Instead, I added 2 publicly available data sets, one for each version.

I tried modifying the github action to download them, but it seems that this was not really successful. If someone can give me some pointers that would be wonderful.

Cheers!