Store factor to file

[JKutt]

Starting pull request for pydiso store factorizations to file and reload

[codecov]

Codecov Report

❌ Patch coverage is 74.41860% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.59%. Comparing base (0bfacfa) to head (68ed277).
⚠️ Report is 77 commits behind head on main.

Files with missing lines	Patch %	Lines
pydiso/mkl_solver.pyx	74.41%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #4      +/-   ##
==========================================
+ Coverage   70.22%   71.59%   +1.36%     
==========================================
  Files           2        2              
  Lines         225      264      +39     
==========================================
+ Hits          158      189      +31     
- Misses         67       75       +8     

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[JKutt]

@jcapriot everything passing! Have a look when you have a moment. The flag files seem a little clunky but for large problems specifically, there needs to be something to flag that the factorization is complete. Certainly open to suggestions!