Add ts.mutations_inherited_state

[benjeffery]

Partly addresses #2631

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.80%. Comparing base (3edb2e6) to head (448d7dc).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3276   +/-   ##
=======================================
  Coverage   89.80%   89.80%           
=======================================
  Files          29       29           
  Lines       32602    32612   +10     
  Branches     5973     5974    +1     
=======================================
+ Hits        29278    29288   +10     
  Misses       1884     1884           
  Partials     1440     1440           

Flag	Coverage Δ
c-tests	86.85% <ø> (ø)
lwt-tests	80.38% <ø> (ø)
python-c-tests	88.25% <ø> (ø)
python-tests	98.80% <100.00%> (+<0.01%)	⬆️
python-tests-no-jit	32.94% <30.00%> (-0.01%)	⬇️
python-tests-numpy1	50.56% <40.00%> (-0.02%)	⬇️

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Files with missing lines	Coverage Δ
python/tskit/trees.py	98.84% <100.00%> (+<0.01%)	⬆️

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