fix(client): Include request in initial subscribe to gRPC endpoint to fix LB connection delay #252
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Some load balancers (eg. Cloudflare) expect a message to come through before passing a gRPC connection through to origin. Because the current subscribe method connects, and then sends a message, it causes a delay when connecting. This pr adds
subscribe_with_request
which pushes a request into the channel before sending the subscribe request. This resolves the LB issue