feat: add cosem models, downloading, caching, binning, and tests

[tlambert03]

pulls out a lot of the cosem logic from #18 ... more needed still to hook it up to the simulation

[codecov]

Codecov Report

Attention: Patch coverage is 77.16702% with 108 lines in your changes missing coverage. Please review.

Project coverage is 84.64%. Comparing base (47a8106) to head (19bfa80).
Report is 1 commits behind head on main.

❗ Current head 19bfa80 differs from pull request most recent head 171ac25

Please upload reports for the commit 171ac25 to get more accurate results.

Files	Patch %	Lines
src/microsim/cosem/_tstore.py	42.37%	68 Missing ⚠️
src/microsim/util.py	25.00%	18 Missing ⚠️
src/microsim/cosem/models.py	94.59%	10 Missing ⚠️
src/microsim/cosem/_client.py	93.54%	6 Missing ⚠️
src/microsim/cosem/manage.py	91.48%	4 Missing ⚠️
src/microsim/schema/detectors/_simulate.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #50      +/-   ##
==========================================
+ Coverage   80.45%   84.64%   +4.19%     
==========================================
  Files          43       44       +1     
  Lines        2118     2312     +194     
==========================================
+ Hits         1704     1957     +253     
+ Misses        414      355      -59     

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