♻️ Refactor organism handling in curators

[falexwolf]

Is part of a sequence of PRs that refactors the curators:

• ♻️ Re-purpose BaseCurator as Curator and introduce CatCurator #2416
• 🚚 Bulk-rename old-style curators to CatCurator #2413
• 🎨 Self-contained definition of CellxGene schema #2412
• 🚚 Move PertCurator from wetlab here and add CellxGene Curator test #2408
• 🚚 Move CellxGene Curator from cellxgene-lamin here #2403
• ✨ Schema-based curators: DataFrameCurator #2388

---

Replace self._kwargs with explicit organism passing; remove ability to pass an organism ad-hoc in .validate() etc.

• goal is to define an organism as part of a feature dtype in cases in which it is needed -- e.g., Gene.ensembl_gene_id does not need it, whereas Gene.symbol needs it
• there should and can't be no need to pass an organism at any later stages of the workflow; it both opens up the door for integrity errors and makes the code complicated

[codecov]

Codecov Report

Attention: Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.48%. Comparing base (d503387) to head (57bd94f).
Report is 34 commits behind head on main.

Files with missing lines	Patch %	Lines
lamindb/curators/__init__.py	96.42%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2415      +/-   ##
==========================================
- Coverage   91.71%   91.48%   -0.24%     
==========================================
  Files          62       62              
  Lines        9138     9601     +463     
==========================================
+ Hits         8381     8783     +402     
- Misses        757      818      +61     

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