feat(package): fewer dependencies with fewer version pins

[justindujardin]

Mathy requires a specific version of the excellent Fragile library, and its dependencies are quite old making it a bit, erm fragile 😅

The source fork has moved on, and so to keep things reliable we'll inline the swarm solver.

[codecov]

Codecov Report

Attention: 507 lines in your changes are missing coverage. Please review.

Comparison is base (83176a2) 95.54% compared to head (3ce3f0f) 66.07%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
...ibraries/mathy_python/mathy/fragile/core/states.py	56.34%	110 Missing ⚠️
...mathy_python/mathy/fragile/core/distributed_env.py	41.31%	98 Missing ⚠️
...braries/mathy_python/mathy/fragile/core/walkers.py	73.30%	63 Missing ⚠️
...ibraries/mathy_python/mathy/fragile/core/models.py	55.93%	52 Missing ⚠️
...es/mathy_python/mathy/fragile/core/base_classes.py	73.07%	49 Missing ⚠️
...ibraries/mathy_python/mathy/fragile/core/bounds.py	29.41%	48 Missing ⚠️
libraries/mathy_python/mathy/fragile/core/swarm.py	67.12%	48 Missing ⚠️
libraries/mathy_python/mathy/fragile/core/utils.py	50.00%	22 Missing ⚠️
libraries/mathy_python/mathy/fragile/core/env.py	84.48%	9 Missing ⚠️
...raries/mathy_python/mathy/fragile/core/wrappers.py	68.42%	6 Missing ⚠️
... and 2 more

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #95       +/-   ##
===========================================
- Coverage   95.54%   66.07%   -29.47%     
===========================================
  Files           5       19       +14     
  Lines         202     1524     +1322     
===========================================
+ Hits          193     1007      +814     
- Misses          9      517      +508     

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[github-actions]

🎉 This PR is included in version 0.9.6 🎉

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