Add AtomMappingError

[jthorton]

Fixes #419. This error should be raised by the derived atom mappers when there is an issue generating mappings.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.51%. Comparing base (21b1382) to head (378a11e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #440   +/-   ##
=======================================
  Coverage   98.51%   98.51%           
=======================================
  Files          37       38    +1     
  Lines        2156     2158    +2     
=======================================
+ Hits         2124     2126    +2     
  Misses         32       32           

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[jthorton]

pre-commit.ci autofix