feat(csharp): support OpenAPI 3.2 query parameters

[HavenDV]

Summary

• add request generation support for OpenAPI 3.2 in: querystring parameters and cookie parameters
• support emitting pre-serialized raw query string fragments in the generated path builder
• add a focused CLI regression covering query, additionalOperations, querystring, and cookie

Verification

• dotnet build /p:TreatWarningsAsErrors=true
• dotnet test src/tests/AutoSDK.IntegrationTests.Cli/AutoSDK.IntegrationTests.Cli.csproj --filter "FullyQualifiedName~Generate_WithOpenApi32QueryStringCookieAndAdditionalOperations_BuildsAndEmitsSupport"

Closes #232