Add file visibility option

[jamescourtney]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 96.88%. Comparing base (9808c65) to head (86116b3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #435      +/-   ##
==========================================
- Coverage   96.91%   96.88%   -0.04%     
==========================================
  Files         126      126              
  Lines        9739     9740       +1     
  Branches      788      791       +3     
==========================================
- Hits         9439     9437       -2     
  Misses        210      210              
- Partials       90       93       +3     

Files	Coverage Δ
src/FlatSharp.Compiler/CompilerOptions.cs	100.00% <ø> (ø)
src/FlatSharp.Compiler/SchemaModel/RootModel.cs	99.09% <100.00%> (ø)
src/FlatSharp/FlatBufferSerializerOptions.cs	81.25% <ø> (ø)
...atSharp/Serialization/RoslynSerializerGenerator.cs	97.77% <100.00%> (-0.38%)	⬇️
src/FlatSharp.Compiler/CloneMethodsGenerator.cs	91.37% <50.00%> (-1.61%)	⬇️

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