Total surface area to volume

[rtimms]

Description

Adds total surface area to volume ratio for use in composite model with surface formulation

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 98.89%. Comparing base (08008d1) to head (db73043).
⚠️ Report is 159 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #5165   +/-   ##
========================================
  Coverage    98.89%   98.89%           
========================================
  Files          320      320           
  Lines        26430    26435    +5     
========================================
+ Hits         26137    26142    +5     
  Misses         293      293           

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