Creates proxy in the EDB Postgres Distributed cluster.
Synopsis
Creates proxy in the EDB Postgres Distributed cluster and attaches it to the
given group. The proxy name must be unique across the cluster and match with
the name given in the corresponding proxy config file.
Use the proxy mode to route connections to Write Leader (default), Read Nodes
(read-only), or both (any). Proxy listens on 'listen_port' for Write Leader
connections while on 'read_listen_port' for Read Nodes connections.