Lambda Expression Walker

[pauldhein]

Overview

• Implements a parser and walker for lambda expressions stored in the GrFN LambdaNodes
• Converts expressions to a tree using ExpressionNodes that include children lists with implied ordering of children for binary operators, comparators, calls, etc.
• Includes a nodes2digraph method that converts a collection nodes into a DiGraph that can then be output as a PDF for visual analysis
• Includes a script /scripts/model_assembly/expression_walker.py that takes a GrFN JSON as input, converts all lambda expressions found in the GrFN, and then outputs the ExpressionNode collection in a new JSON file

[codecov[bot]]

Codecov Report

Merging #191 (18d144f) into master (80c2c47) will increase coverage by 0.33%. The diff coverage is 95.45%.

@@            Coverage Diff             @@
##           master     #191      +/-   ##
==========================================
+ Coverage   66.65%   66.99%   +0.33%     
==========================================
  Files          74       75       +1     
  Lines       13680    13829     +149     
==========================================
+ Hits         9119     9265     +146     
- Misses       4561     4564       +3     

Impacted Files	Coverage Δ
automates/model_assembly/networks.py	75.42% <79.16%> (-0.11%)	:arrow_down:
automates/model_assembly/expression_visitor.py	97.95% <97.95%> (ø)
automates/utils/misc.py	85.71% <100.00%> (+7.93%)	:arrow_up:

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[dpdicken]

The actual changes look good! Are you switched to using the black python formatter? It seems like every PR we reformat some files (i.e. networks.py in this pr)