requestMembers
Executes the request on this gateway, returning a flow of MembersChunkEvent responses.
The returned flow is cold, and will execute the request only on subscription. Collection of this flow on a Gateway that is not running will result in an IllegalStateException being thrown.
Executing the request on a Gateway with a Shard that does not match the guild id can result in undefined behavior for the returned flow and inconsistencies in the cache.
This function expects request.nonce to contain a value, but it is not required. If no nonce was provided one will be generated instead.