Adding PooledCellPainting

[gwaybio]

The followup PR from #44

Adds pooled/process.py which includes PooledCellPainting. The class stores methods to merge site specific Cells, Nuclei, and Cytoplasm, normalize (using pycytominer.normalize()), and concatenate sites together.

[codecov-io]

Codecov Report

Merging #45 into master will increase coverage by 0.33%.
The diff coverage is 94.09%.

@@            Coverage Diff             @@
##           master      #45      +/-   ##
==========================================
+ Coverage   95.88%   96.21%   +0.33%     
==========================================
  Files          32       34       +2     
  Lines        1046     1349     +303     
==========================================
+ Hits         1003     1298     +295     
- Misses         43       51       +8

Impacted Files	Coverage Δ
pycytominer/cyto_utils/util.py	100% <100%> (+43.47%)	⬆️
pycytominer/tests/test_cyto_utils/test_util.py	100% <100%> (ø)	⬆️
pycytominer/pooled/process.py	91.04% <91.04%> (ø)
pycytominer/tests/test_pooled/test_process.py	96.22% <96.22%> (ø)

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