Add PsIChi plot option to source injector

[GallegoSav]

read the title dude

[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.14%. Comparing base (f1872c4) to head (74e4b27).
⚠️ Report is 22 commits behind head on develop.

Files with missing lines	Patch %	Lines
cosipy/source_injector/source_injector.py	64.28%	5 Missing ⚠️
cosipy/data_io/UnBinnedData.py	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
cosipy/data_io/UnBinnedData.py	89.57% <0.00%> (-0.37%)	⬇️
cosipy/source_injector/source_injector.py	69.36% <64.28%> (+8.10%)	⬆️

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[ckarwin]

@GallegoSav Please add code coverage!