Add support for binary request body

[AllyW]

tsp request binary body:

  @doc("The file content as application/octet-stream.")
  @bodyRoot
   body: bytes;

output:

{
    "json": {
        "schema": {
            "type": "binary",
            "name": "body",
            "description": "The file content as application/octet-stream.",
            "required": true
        }
    }
}