Cancel node traversal

[forman]

new RuleExit exception to exit rule logic and stop further node traversal

Checklist (strike out non-applicable):

• Changes documented in CHANGES.md
• Related issue exists and is referred to in the PR description and CHANGES.md
• Added docstrings and API docs for any new/modified user-facing classes and functions
• Changes/features documented in docs/*
• Unit-tests adapted/added for changes/features
• Test coverage remains or increases (target 100%)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.95%. Comparing base (5647713) to head (2fb3da9).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #11      +/-   ##
==========================================
+ Coverage   95.94%   95.95%   +0.01%     
==========================================
  Files          51       51              
  Lines        1725     1732       +7     
  Branches      232      232              
==========================================
+ Hits         1655     1662       +7     
  Misses         36       36              
  Partials       34       34              

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