New creates a bufconn listener ready to attach servers and clients to.

Allows you to pass an already instantiated grpc bufconn.Listener into the Listener.

The default buffer size is 1MiB -- if ou need a larger buffer to send larger messages then specify this dial option with a larger size.

WithTarget allows the user to change the "endpoint" of the connection from "bufnet" to some other endpoint.

Listener handles gRPC connections using an in-memory buffer that is useful for testing to prevent actual TCP network requests.

DialOption -- optional arguments for constructing a Listener.