[CSharp] Codegen method return type nullable

Hi,

it is pretty annoying to make every member [required] but ok.
How to define that return type is not nullable?
Im using Swashbuckle 5.6.0

bool HasUser(string Username) //server side
bool? HasUser(string Username) // client side

What i need is something like
[required]bool HasUser(string Username) // server

I try to inject some required and x-nullable just if it work but it not.

"responses": {
          "200": {
            "description": "OK",
            "schema": {
              "type": "boolean",
              "x-type-dotnet": "System.Boolean",
              "x-nullable": false,
              "required": true
            },
            "x-null": false,
            "required": true,
            "x-type-dotnet": "System.Boolean",
            "x-nullable": false
          }
        }

Start by reproducing the generated C# client from the Swashbuckle 5.6.0 schema shown in the issue and inspect how the response schema's nullable metadata is interpreted. Done means the generated HasUser method returns bool rather than bool? without requiring unsupported schema changes.