Add IggyTop as receptor reference database

[grst]

Closes #404

• See checklist in Hackathon: add generic_ir_from_biocypher() function to ingest TCR data #404 (comment)

• CHANGELOG.md updated

• Tests added (For bug fixes or new features)

• Tutorial updated (if necessary)

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[codecov]

Codecov Report

❌ Patch coverage is 44.44444% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 19.32%. Comparing base (c0a3947) to head (0eaa8da).

Files with missing lines	Patch %	Lines
src/scirpy/datasets/__init__.py	44.44%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #652   +/-   ##
=======================================
  Coverage   19.31%   19.32%           
=======================================
  Files          51       51           
  Lines        4633     4642    +9     
=======================================
+ Hits          895      897    +2     
- Misses       3738     3745    +7     

Files with missing lines	Coverage Δ
src/scirpy/datasets/__init__.py	27.21% <44.44%> (+1.12%)	⬆️

... and 1 file with indirect coverage changes

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