Add option to vectorize connectivity matrices

[tsalo]

Changes proposed in this pull request

Documentation that should be reviewed

[tsalo]

Converting to a draft because this isn't high priority right now.

[codecov]

Codecov Report

Attention: Patch coverage is 46.15385% with 35 lines in your changes missing coverage. Please review.

Project coverage is 78.61%. Comparing base (9275de8) to head (0a0fe0f).

Files with missing lines	Patch %	Lines
xcp_d/interfaces/connectivity.py	37.50%	32 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1308      +/-   ##
==========================================
- Coverage   78.90%   78.61%   -0.29%     
==========================================
  Files          59       59              
  Lines        7381     7445      +64     
  Branches      956      962       +6     
==========================================
+ Hits         5824     5853      +29     
- Misses       1266     1298      +32     
- Partials      291      294       +3     

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