Package ccphylo config default

[colganwi]

Summary

• add the default ccphylo config.ini to the cassiopeia package data so it ships with builds
• include the config file in the manifest to ensure it is present in source distributions

Testing

• pytest -q tests/solver_tests/ccphylo_solver_test.py -p no:warnings

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Codex Task

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.91%. Comparing base (0d1688d) to head (071560e).
⚠️ Report is 3 commits behind head on 3.0.0.

Additional details and impacted files

@@           Coverage Diff           @@
##            3.0.0     #281   +/-   ##
=======================================
  Coverage   86.91%   86.91%           
=======================================
  Files          76       76           
  Lines        5922     5922           
=======================================
  Hits         5147     5147           
  Misses        775      775           

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