Adding PsiChi plot in the source injector

[GallegoSav]

I added an option make_PsiChi_plot for getting the expected PsiChi map from the model.

[codecov]

Codecov Report

❌ Patch coverage is 11.95652% with 324 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.45%. Comparing base (f22aa8a) to head (031d9e6).

Files with missing lines	Patch %	Lines
cosipy/data_io/UnBinnedData.py	11.64%	311 Missing ⚠️
cosipy/source_injector/source_injector.py	23.07%	10 Missing ⚠️
cosipy/data_io/ReadTraTest.py	0.00%	3 Missing ⚠️

❌ Your patch check has failed because the patch coverage (11.95%) is below the target coverage (100.00%). You can increase the patch coverage or adjust the target coverage.

Files with missing lines	Coverage Δ
cosipy/data_io/ReadTraTest.py	19.04% <0.00%> (-0.71%)	⬇️
cosipy/source_injector/source_injector.py	58.55% <23.07%> (-5.08%)	⬇️
cosipy/data_io/UnBinnedData.py	50.00% <11.64%> (-40.18%)	⬇️

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[ckarwin]

@GallegoSav What is the status of this PR? It seems to contain changes from the CO sequence, which should be part of PR #362. Also, I'm not sure why the entire unbinned data class has been recopied, and is actually duplicated in the file. Something is not right here. Also, the new code needs coverage. Please let me know the status.