ID is the member ID for this member.
isLearner indicates if the member is raft learner.
name is the human-readable name of the member. If the member is not started, the name will be an empty string.
peerURLs is the list of URLs the member exposes to the cluster for communication.
clientURLs is the list of URLs the member exposes to clients for communication. If the member is not started, clientURLs will be empty.