Function which is used to tell a Worker that it should identify a resharder Shard to the gateway and wait for further instructions.
The worker should NOT process any events coming from this Shard.
Tell the resharder and manager that the a shard is created and identified using new settings but is currently pending by ignoring incoming events. This can be used to track all shards are online which is when old shards are closed and these new shards replace the old ones.
Used to update the shard ids of the cached guilds. When a bot is resharded, guilds can be moved around across shards to evenly distribute, so the shards need to be updated.