Compute graphs

[olynch]

Currently, I've just outlined the data structures.

[codecov]

Codecov Report

Attention: Patch coverage is 89.99009% with 101 lines in your changes missing coverage. Please review.

Project coverage is 84.37%. Comparing base (bd3df8e) to head (13a5cee).

Files	Patch %	Lines
src/syntax/gats/ast.jl	84.56%	23 Missing ⚠️
src/syntax/gats/algorithms.jl	77.90%	19 Missing ⚠️
src/util/Dtrys.jl	95.15%	11 Missing ⚠️
src/nonstdlib/dynamics/ResourceSharers.jl	94.79%	9 Missing ⚠️
src/models/ComputeGraphs.jl	0.00%	8 Missing ⚠️
src/util/MyActive.jl	81.81%	6 Missing ⚠️
src/models/ModelInterface.jl	86.48%	5 Missing ⚠️
src/util/SumTypes.jl	94.62%	5 Missing ⚠️
src/syntax/gats/exprinterop.jl	93.84%	4 Missing ⚠️
src/syntax/TheoryInterface.jl	93.02%	3 Missing ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #160      +/-   ##
==========================================
- Coverage   93.85%   84.37%   -9.49%     
==========================================
  Files          38       42       +4     
  Lines        2229     2873     +644     
==========================================
+ Hits         2092     2424     +332     
- Misses        137      449     +312     

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