Add support for multiprocessing via ray, add builders and pydantic models, bug fixes

[mattmcdermott]

This is a massive PR that addresses several issues:

• Issue Reaction enumerators can be sped up with multiprocessing #101 : Added multiprocessing via ray dependency to speed up reaction enumeration
• Issue Oversight: calculate_e_above_hulls function in GibbsEntrySet only works when entries cover whole phase diagram #103 : Bug fix to prevent error when calculating e_above_hull without terminal elements
• Issue ReactionsToDb often encounters MongoDB doc limit #104: Added support for GridFS to help with large ReactionSet objects

Additionally, a builder for synthesis recipes was added and pydantic models were added to help facilitate data storage.

[codecov-commenter]

Codecov Report

Merging #106 (3544f31) into main (bf6a458) will decrease coverage by 4.10%.
The diff coverage is 13.76%.

❗ Current head 3544f31 differs from pull request most recent head d6b3fcb. Consider uploading reports for the commit d6b3fcb to get more accurate results

@@            Coverage Diff             @@
##             main     #106      +/-   ##
==========================================
- Coverage   46.01%   41.90%   -4.11%     
==========================================
  Files          54       57       +3     
  Lines        2708     3076     +368     
  Branches      521      583      +62     
==========================================
+ Hits         1246     1289      +43     
- Misses       1423     1743     +320     
- Partials       39       44       +5     

Impacted Files	Coverage Δ
src/rxn_network/builders/retrosynthesis.py	0.00% <0.00%> (ø)
src/rxn_network/costs/competitiveness.py	0.00% <0.00%> (ø)
src/rxn_network/enumerators/__init__.py	100.00% <ø> (ø)
src/rxn_network/enumerators/minimize.py	94.82% <ø> (ø)
src/rxn_network/firetasks/build_inputs.py	0.00% <0.00%> (ø)
src/rxn_network/firetasks/parse_outputs.py	0.00% <0.00%> (ø)
src/rxn_network/firetasks/run_calc.py	0.00% <0.00%> (ø)
src/rxn_network/firetasks/utils.py	0.00% <0.00%> (ø)
src/rxn_network/fireworks/core.py	0.00% <0.00%> (ø)
src/rxn_network/pathways/solver.py	15.89% <0.00%> (ø)
... and 10 more

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