Move sparse histogram to hipscat

[camposandro]

Move the SparseHistogram implementation that currently resides in the importer to hipscat. LSDB will use it to compute the point map distributions more efficiently.

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• My code follows the code style of this project
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.73%. Comparing base (526f5c1) to head (d9efe2f).

Additional details and impacted files

@@               Coverage Diff               @@
##           development     #405      +/-   ##
===============================================
- Coverage        99.73%   99.73%   -0.01%     
===============================================
  Files               26       25       -1     
  Lines             1520     1484      -36     
===============================================
- Hits              1516     1480      -36     
  Misses               4        4              

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