add MindOpt solver

[fneum]

https://solver.damo.alibaba.com/doc/en/html/index.html

https://opt.alibabacloud.com/portal?lang=en

does not require special license setup

Free for personal and commercial end-users, but not open-source as far as I can see.

Performed quite well in benchmarks: https://plato.asu.edu/ftp/lpopt.html

Tested locally and passed all tests. However, quadratic problems are not supported yet.

import pypsa

n = pypsa.examples.ac_dc_meshed()
n.optimize(solver_name='highs')
n.buses_t.marginal_price["London"]
n.generators_t.p
n.optimize(solver_name='mindopt')
n.generators_t.p
n.buses_t.marginal_price["London"]

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (b91f08d) 89.25% compared to head (29ce758) 89.18%.
Report is 2 commits behind head on master.

❗ Current head 29ce758 differs from pull request most recent head 6500536. Consider uploading reports for the commit 6500536 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #188      +/-   ##
==========================================
- Coverage   89.25%   89.18%   -0.07%     
==========================================
  Files          15       15              
  Lines        3182     3228      +46     
  Branches      731      738       +7     
==========================================
+ Hits         2840     2879      +39     
- Misses        237      243       +6     
- Partials      105      106       +1     

Files	Coverage Δ
linopy/solvers.py	89.52% <84.78%> (-0.59%)	⬇️

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