Support for Sparse Matrices

[samuelsonric]

• Constructors take adjacency matrices as inputs.
• ordered graphs stored as (sparse) adjacency matrices -- 10x performance improvement!
• Pretty printing

[codecov]

Codecov Report

Attention: Patch coverage is 87.96791% with 45 lines in your changes missing coverage. Please review.

Project coverage is 84.54%. Comparing base (2549aa4) to head (4241127).

Files with missing lines	Patch %	Lines
src/junction_trees/ordered_graphs.jl	79.01%	17 Missing ⚠️
src/junction_trees/junction_trees.jl	83.58%	11 Missing ⚠️
src/junction_trees/trees.jl	91.42%	6 Missing ⚠️
src/junction_trees/fixed_stacks.jl	75.00%	4 Missing ⚠️
src/junction_trees/elimination_algorithms.jl	93.61%	3 Missing ⚠️
src/junction_trees/child_indices.jl	84.61%	2 Missing ⚠️
src/junction_trees/orders.jl	88.23%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
- Coverage   87.15%   84.54%   -2.61%     
==========================================
  Files          14       14              
  Lines         654      673      +19     
==========================================
- Hits          570      569       -1     
- Misses         84      104      +20     

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