Feat flow dag

[jmccreight]

• Closes Implement STARFIT into PRMSChannel network #176
• Tests added
• Performance benchmarks added
• Performance regression benchmarks run
• User visible changes (including notable bug fixes) are documented in whats-new.rst
• New functions/methods are listed in api.rst or it's sub rsts?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 74.06114% with 297 lines in your changes missing coverage. Please review.

Project coverage is 73.01%. Comparing base (55181d5) to head (8d121ea).
Report is 2 commits behind head on develop.

❗ Current head 8d121ea differs from pull request most recent head 4ee456a

Please upload reports for the commit 4ee456a to get more accurate results.

Files	Patch %	Lines
pywatershed/plot/domain_plot.py	0.00%	97 Missing ⚠️
pywatershed/parameters/starfit_parameters.py	20.58%	54 Missing ⚠️
pywatershed/hydrology/starfit.py	85.57%	44 Missing ⚠️
pywatershed/hydrology/prms_channel_flow_graph.py	90.16%	30 Missing ⚠️
pywatershed/base/budget.py	63.63%	28 Missing ⚠️
pywatershed/hydrology/obsin_node.py	46.93%	26 Missing ⚠️
pywatershed/base/flow_graph.py	91.08%	14 Missing ⚠️
pywatershed/plot/__init__.py	0.00%	2 Missing ⚠️
pywatershed/base/conservative_process.py	90.90%	1 Missing ⚠️
pywatershed/base/process.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #233      +/-   ##
===========================================
+ Coverage    72.34%   73.01%   +0.66%     
===========================================
  Files           53       59       +6     
  Lines         6842     7938    +1096     
===========================================
+ Hits          4950     5796     +846     
- Misses        1892     2142     +250     

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