Run CI for .NET interface

[speth]

Changes proposed in this pull request

• Test the .NET interface on Windows, Linux, and macOS
• Include coverage of the C++ code generated by the .NET tests
• TODO: add code coverage for .NET code

If applicable, fill in the issue number this pull request is fixing

Closes #

If applicable, provide an example illustrating new features this pull request is introducing

Checklist

• The pull request includes a clear description of this code change
• Commit messages have short titles and reference relevant issues
• Build passes (scons build & scons test) and unit tests address code coverage
• Style & formatting of contributed code follows contributing guidelines
• The pull request is ready for review

[codecov]

Codecov Report

Merging #1401 (3af03d3) into main (f1d86d1) will increase coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1401      +/-   ##
==========================================
+ Coverage   71.06%   71.15%   +0.08%     
==========================================
  Files         363      373      +10     
  Lines       51911    52281     +370     
  Branches    17374    17374              
==========================================
+ Hits        36890    37198     +308     
- Misses      12674    12728      +54     
- Partials     2347     2355       +8     

Impacted Files	Coverage Δ
...terfaces/dotnet/Cantera/src/Interop/InteropUtil.cs	60.75% <0.00%> (ø)
interfaces/dotnet/Cantera/src/Application.cs	93.87% <0.00%> (ø)
interfaces/dotnet/Cantera/src/ExtensionMethods.cs	100.00% <0.00%> (ø)
interfaces/dotnet/Cantera/src/Enums.cs	91.66% <0.00%> (ø)
interfaces/dotnet/Cantera/src/SpeciesCollection.cs	32.40% <0.00%> (ø)
interfaces/dotnet/Cantera/src/Species.cs	58.33% <0.00%> (ø)
interfaces/dotnet/Cantera/src/Exceptions.cs	100.00% <0.00%> (ø)
interfaces/dotnet/Cantera/src/ThermoPhase.cs	32.50% <0.00%> (ø)
...rfaces/dotnet/Cantera/src/Interop/CanteraHandle.cs	78.57% <0.00%> (ø)
...aces/dotnet/Cantera/src/DataDirectoryCollection.cs	91.30% <0.00%> (ø)
... and 8 more

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[ischoegl]

@speth … thanks! This looks good to me.