Gmsh sidesets

[cmhamel]

Adding support for gmsh sidesets for some element types.

[codecov]

Codecov Report

❌ Patch coverage is 89.04110% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.29%. Comparing base (d6c23fe) to head (6ee31e4).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
ext/GmshExt.jl	89.04%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #322      +/-   ##
==========================================
+ Coverage   69.07%   69.29%   +0.21%     
==========================================
  Files          55       55              
  Lines        6134     6200      +66     
==========================================
+ Hits         4237     4296      +59     
- Misses       1897     1904       +7     

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