Boundary mesh size

[aabills]

Description

follow up to #5107 providing the distance from the center of the control volume to the edge at the boundary

Fixes # (issue)

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #)

Important checks:

Please confirm the following before marking the PR as ready for review:

• No style issues: nox -s pre-commit
• All tests pass: nox -s tests
• The documentation builds: nox -s doctests
• Code is commented for hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.09%. Comparing base (6b05386) to head (d8a5324).
⚠️ Report is 147 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5108      +/-   ##
===========================================
- Coverage    99.10%   99.09%   -0.01%     
===========================================
  Files          307      307              
  Lines        23686    23708      +22     
===========================================
+ Hits         23473    23494      +21     
- Misses         213      214       +1     

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