Create chunk option for normalization and gene selection

[Sichao25]

• Create a chunk option for normalization
• Create a chunk option for gene selection

PS: Part of the code needs to specift the precision (float64, float32, int). We need to consider a tradeoff between time and memory.

[codecov-commenter]

Codecov Report

Merging #598 (d2fed88) into master (1e8ffe4) will increase coverage by 0.08%.
The diff coverage is 51.78%.

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@@            Coverage Diff             @@
##           master     #598      +/-   ##
==========================================
+ Coverage   22.54%   22.63%   +0.08%     
==========================================
  Files         166      166              
  Lines       27362    27441      +79     
==========================================
+ Hits         6168     6210      +42     
- Misses      21194    21231      +37     

Files	Coverage Δ
dynamo/preprocessing/gene_selection.py	29.88% <0.00%> (-0.27%)	⬇️
dynamo/preprocessing/normalization.py	61.29% <66.10%> (+1.55%)	⬆️
dynamo/configuration.py	78.74% <47.50%> (-4.31%)	⬇️

... and 1 file with indirect coverage changes

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