Add OpenAPI/Swagger support to minimal actions

[halter73]

• Ideally done using purely endpoint metadata
• Might be done by leveraging Mvc.ApiExploer and implementing IApiDescriptionProvider
• Otherwise, needs design

[JamesNK]

I added Swashbuckle support using endpoint metadata for gRPC HTTP API

See: https://github.com/aspnet/AspLabs/tree/002b32674e5a4ff306158618f9d0789707e70753/src/GrpcHttpApi/src/Microsoft.AspNetCore.Grpc.Swagger

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