Is your feature request related to a problem? Please describe.

No.

Describe the solution you'd like

cloud.google.com/go/storage supports the Cloud Storage gRPC API (docs). A major advantage is that it can use Direct Connectivity.

I would like to have be able to use the blob abstraction while still being able to use the gRPC API. I am not sure what the best way to achieve this is. Some options include:

1. Adding UseGRPCClient to the Options which switches the client from HTTP to gRPC. This might be weird because the OpenBucket contains a gcp.HTTPClient.
2. Adding an OpenBucketUsingGrpc as an additional function in gocloud.dev/blob/gcsblob, which takes a grpc.ClientConn. Additionally add a Dial function similar to the one in gcppubsub (see Dial).

Describe alternatives you've considered

I don't think there is any alternative except using cloud.google.com/go/storage directly (I might be mistaken).

Additional context

NA.