Add csd connectivity

[kajal5888]

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[tensionhead]

Nice work @kajal5888 ! See my detailed comments below, I think most critical would be to rename the new_cfg entry for this frontend, as this right now breaks replayability.

You would also see this in a proper test however, would be great you could add a class TestCSD in /tests/test_connectivity.py. The easiest test I could think of, is to take the same synth data as in TestCoherence , and plug the new output generated with method='csd' into an existing csd normalization routine to recover the coherence from that csd.

[codecov]

Codecov Report

Base: 68.70% // Head: 68.04% // Decreases project coverage by -0.67% ⚠️

Coverage data is based on head (50e87f1) compared to base (35e635d).
Patch coverage: 82.14% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #416      +/-   ##
==========================================
- Coverage   68.70%   68.04%   -0.67%     
==========================================
  Files          79       80       +1     
  Lines        9610     9632      +22     
  Branches     1995     2010      +15     
==========================================
- Hits         6603     6554      -49     
- Misses       2502     2559      +57     
- Partials      505      519      +14     

Impacted Files	Coverage Δ
syncopy/nwanalysis/connectivity_analysis.py	72.00% <82.14%> (+0.96%)	⬆️
syncopy/datatype/methods/show.py	61.66% <0.00%> (-13.34%)	⬇️
syncopy/datatype/discrete_data.py	66.55% <0.00%> (-11.76%)	⬇️
syncopy/datatype/methods/selectdata.py	76.04% <0.00%> (-2.69%)	⬇️
syncopy/shared/parsers.py	73.33% <0.00%> (-1.78%)	⬇️
syncopy/nwanalysis/wilson_sf.py	92.75% <0.00%> (-1.45%)	⬇️
syncopy/datatype/base_data.py	76.53% <0.00%> (-1.40%)	⬇️
syncopy/shared/kwarg_decorators.py	85.20% <0.00%> (-0.80%)	⬇️
syncopy/statistics/spike_psth.py	95.34% <0.00%> (-0.06%)	⬇️
syncopy/datatype/__init__.py	100.00% <0.00%> (ø)
... and 5 more

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[tensionhead]

Looks good, thx @kajal5888 !