add consumes/ produces attribute

Is it possible to have a base endpoint class with custom attributes like:

[Produces("application/x-msgpack")]
[Consumes("application/x-msgpack")]
public class CustomEndpointBase : EndpointBaseAsync
{
}

Start by reviewing EndpointBaseAsync and the ASP.NET Core handling of the Produces and Consumes attributes shown in the request. Determine whether attributes on a custom base endpoint should affect derived endpoints, and define completion as those media types being recognized for the generated endpoint metadata.

Written by the indexing model from the issue text.