Add test for vector sync

[thejumpman2323]

Description

This pr intends to add tests for copy vectors which implicitly test vector database sync with CDC

Resolves:
#632
#388

Related Issues

Checklist

• Is this code covered by new or existing unit tests or integration tests?
• Did you run make test successfully?
• Do new classes, functions, methods and parameters all have docstrings?
• Were existing docstrings updated, if necessary?
• Was external documentation updated, if necessary?

Additional Notes or Comments

[thejumpman2323]

@blythed Lancedb do not support torch tensors, hence I had to convert explicitly
let me know if the above seems alrite to you

[codecov-commenter]

Codecov Report

Patch coverage: 86.30% and project coverage change: +0.61% 🎉

Comparison is base (ad0b706) 79.97% compared to head (f0cd5df) 80.59%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #629      +/-   ##
==========================================
+ Coverage   79.97%   80.59%   +0.61%     
==========================================
  Files          80       80              
  Lines        4865     4922      +57     
==========================================
+ Hits         3891     3967      +76     
+ Misses        974      955      -19     

Files Changed	Coverage Δ
superduperdb/db/mongodb/cdc.py	83.37% <82.75%> (+7.05%)	⬆️
superduperdb/vector_search/inmemory.py	98.03% <100.00%> (ø)
superduperdb/vector_search/lancedb_client.py	88.04% <100.00%> (+4.09%)	⬆️

... and 3 files with indirect coverage changes

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