Add DMRG pyscf solver interface

[liwt31]

Allow renormalizer to interface with PySCF as a FCI solver. Ab initio calculation with renormalizer can now be performed using a few lines of code by PySCF.

[codecov]

Codecov Report

Attention: Patch coverage is 94.51220% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 85.98%. Comparing base (1b65b1e) to head (7530875).

❗ Current head 7530875 differs from pull request most recent head 320818a

Please upload reports for the commit 320818a to get more accurate results.

Files	Patch %	Lines
renormalizer/mps/gs.py	93.00%	7 Missing ⚠️
renormalizer/model/h_qc.py	97.43%	1 Missing ⚠️
renormalizer/mps/tests/test_gs.py	96.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #169      +/-   ##
==========================================
+ Coverage   85.91%   85.98%   +0.06%     
==========================================
  Files         118      118              
  Lines       12370    12498     +128     
==========================================
+ Hits        10628    10746     +118     
- Misses       1742     1752      +10     

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[jjren]

Good PR. It seems that the default tolerance of np.testing.assert_allclose is too strict.

[liwt31]

Good PR. It seems that the default tolerance of np.testing.assert_allclose is too strict.

Thanks for pointing out. It'll be fixed in the coming commits