Bugfix on Surface material creation and value_with_units

[Alberto-DM]

• added "PhysicsTypes" property on Surface material creation.
• fixed value_with_units in case units=""

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[codecov]

Codecov Report

Merging #3942 (c08f57f) into main (4f64da5) will increase coverage by 0.00%.
Report is 3 commits behind head on main.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3942   +/-   ##
=======================================
  Coverage   81.31%   81.32%           
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  Files         182      182           
  Lines       63060    63070   +10     
=======================================
+ Hits        51279    51293   +14     
+ Misses      11781    11777    -4