Add float_datatype parameter for SingleCells compartment load and merge performance flexibility

[d33bs]

Description

This change adds a float_datatype parameter for use with SingleCells compartment load and merge operations to assist with performance considerations (as cited within WayScience/cell-health-data#10 and other areas). In testing this locally using np.float32 instead of np.float64 I found ~45% reduction in peak memory consumption while running merge_single_cells on small testing datasets (this reduction may vary contingent on dataset).

This change is also related to #198 and #227 (if only to notate datatype considerations).

What is the nature of your change?

• Bug fix (fixes an issue).
• Enhancement (adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• This change requires a documentation update.

Checklist

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• My changes generate no new warnings.
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[codecov-commenter]

Codecov Report

Merging #248 (6801c29) into master (b789165) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #248      +/-   ##
==========================================
- Coverage   95.74%   95.71%   -0.03%     
==========================================
  Files          53       53              
  Lines        2822     2826       +4     
==========================================
+ Hits         2702     2705       +3     
- Misses        120      121       +1     

Flag	Coverage Δ
unittests	95.71% <100.00%> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
pycytominer/cyto_utils/cells.py	96.81% <100.00%> (-0.39%)	⬇️
pycytominer/tests/test_cyto_utils/test_cells.py	100.00% <100.00%> (ø)

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[gwaybio]

Looks good @d33bs ! This should help @axiomcura in WayScience/cell-health-data#10 (I think this was the right PR to tag here, but it will also likely help many others as well!)

[gwaybio]

Looks good @d33bs ! Only two minor comments but then I think we're good to merge.

[gwaybio]

Looks good! I'm going to merge. Thanks @d33bs