Parse grpc connectionstring `h2c|h2cs://[<token>@]host:port[?ServerCrt=<path to server cert>]` Attempt to create generic connectionstring format for grpc connections schema * h2c: specifies insecure connection * h2cs: specifies secure connection Optional loads server cert with `ServerCrt` query option token specifies token for token_auth interceptor host:port required server address and port ServerCrt Path to server certificate (server.crt) Works with TLS enabled (h2cs://...) Has no effect if connection schema is insecure.