Specify proper namespace for the C# client

[kant2002]

Right now C# client in the code has namespace Org.OpenAPITools which seems to be generic namespace for the OpenAPI generator. What I would like to have in the library is some Deribit specific namespace, for example something like Deribit.OpenAPI as base namespace

This could be done by specify packageName and clientPackage properties for csharp-dotnet2 generator
See https://github.com/OpenAPITools/openapi-generator/blob/master/docs/generators/csharp-dotnet2.md

[kant2002]

If nobody want mess with codegeneration process, I could made manual change in the source code to illustrate what I want.