Callback solver

[basilib]

Allows the use of a user defined solver by passing a function to an embedding object. This allows the use of vayesta's post-solver functionality without writing a new solver class.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 128 lines in your changes are missing coverage. Please review.

Project coverage is 0.00%. Comparing base (2ff12e4) to head (755ea05).

Files	Patch %	Lines
vayesta/core/types/wf/rdm.py	0.00%	69 Missing ⚠️
vayesta/solver/callback.py	0.00%	40 Missing ⚠️
vayesta/ewf/fragment.py	0.00%	10 Missing ⚠️
vayesta/ewf/ewf.py	0.00%	4 Missing ⚠️
vayesta/solver/__init__.py	0.00%	3 Missing ⚠️
vayesta/core/qemb/fragment.py	0.00%	1 Missing ⚠️
vayesta/core/types/wf/__init__.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #161    +/-   ##
=======================================
  Coverage    0.00%   0.00%            
=======================================
  Files         154     156     +2     
  Lines       20672   20796   +124     
=======================================
- Misses      20672   20796   +124     

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