Add host models to MICOM

[cdiener]

This adds support for host models. Taxonomy can now include an is_host column to mark host models.

TODO:

• add coupling constraints
• abstract model adding
• add host models into Community
• add a test suite
• handle hosts in cooperative tradeoff
• update docs and describe limitations and strategies
• add it to workflows

[codecov]

Codecov Report

❌ Patch coverage is 53.21429% with 131 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.51%. Comparing base (3bff1ca) to head (10407bc).

Files with missing lines	Patch %	Lines
micom/community.py	51.95%	80 Missing and 6 partials ⚠️
micom/coupling.py	16.66%	25 Missing ⚠️
micom/solution.py	43.75%	8 Missing and 1 partial ⚠️
micom/measures.py	33.33%	2 Missing and 2 partials ⚠️
micom/util.py	78.94%	2 Missing and 2 partials ⚠️
micom/problems.py	80.00%	1 Missing and 1 partial ⚠️
micom/data/__init__.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #248      +/-   ##
==========================================
- Coverage   81.37%   77.51%   -3.86%     
==========================================
  Files          39       40       +1     
  Lines        2303     2491     +188     
  Branches      318      361      +43     
==========================================
+ Hits         1874     1931      +57     
- Misses        294      420     +126     
- Partials      135      140       +5     

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