Index generation improvements

[delucchi-cmu]

Change Description

Closes #206.

• Performs the index de-duplication when reading from the original leaf file.
• Pass the dask client and use explicitly for the compute call.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.75%. Comparing base (c5af8dd) to head (4c58d76).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #248   +/-   ##
=======================================
  Coverage   99.75%   99.75%           
=======================================
  Files          24       24           
  Lines        1204     1204           
=======================================
  Hits         1201     1201           
  Misses          3        3           

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