Rename simulate_summary() to simulate_chain_stats() for clarity

[jamesmbaazam]

This PR closes #118 by renaming simulate_summary() to simulate_chain_stats() to remove the confusion around its name and the role of the summary.epichains method.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.80%. Comparing base (07f6087) to head (45574e3).
Report is 27 commits behind head on main.

❗ Current head 45574e3 differs from pull request most recent head 0bfded5. Consider uploading reports for the commit 0bfded5 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #235   +/-   ##
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  Coverage   98.80%   98.80%           
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  Files           8        8           
  Lines         584      584           
=======================================
  Hits          577      577           
  Misses          7        7           

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[jamesmbaazam]

I'm going to go ahead and merge this PR as it was just a renaming refactor. Any issues with it can be raised an issue.