Plot helper function

[AlexanderCaichen]

Add helper function to replace often-repeated code in functions found in Plot folder.

[Xiaojieqiu]

great work, @AlexanderCaichen! is this ready for review?

[AlexanderCaichen]

@Xiaojieqiu Sichao still needs to take a look but it should be ready for review.

[Sichao25]

Thanks a lot Alex. I left a few comments, mainly about the docstrings.

[codecov-commenter]

Codecov Report

Attention: 59 lines in your changes are missing coverage. Please review.

Comparison is base (389529e) 22.15% compared to head (ed45e4d) 22.56%.
Report is 14 commits behind head on master.

Files	Patch %	Lines
dynamo/plot/utils.py	56.00%	11 Missing ⚠️
dynamo/plot/topography.py	0.00%	8 Missing ⚠️
dynamo/plot/preprocess.py	22.22%	7 Missing ⚠️
dynamo/plot/scVectorField.py	0.00%	6 Missing ⚠️
dynamo/plot/time_series.py	20.00%	4 Missing ⚠️
dynamo/plot/vector_calculus.py	0.00%	4 Missing ⚠️
dynamo/plot/heatmaps.py	25.00%	3 Missing ⚠️
dynamo/plot/connectivity.py	0.00%	2 Missing ⚠️
dynamo/plot/dynamics.py	0.00%	2 Missing ⚠️
dynamo/plot/fate.py	50.00%	2 Missing ⚠️
... and 8 more

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #609      +/-   ##
==========================================
+ Coverage   22.15%   22.56%   +0.40%     
==========================================
  Files         166      166              
  Lines       28058    27540     -518     
==========================================
- Hits         6217     6215       -2     
+ Misses      21841    21325     -516     

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