feat(csharp): expose syntax internals to testing

[Seddryck]

Summary

• grant Expressif.Testing access to the internal syntax model
• retain the existing Expressif.Syntax.Tests friend assembly
• verify the compiled assembly exposes both testing assemblies

Validation

• dotnet test bindings/csharp/Expressif.Syntax.Tests/Expressif.Syntax.Tests.csproj --nologo --no-restore -m:1
• 183 tests passed on each of net8.0, net9.0, and net10.0

Closes #111

[coderabbitai]

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