A rabbitmq-queues grow equivalent is missing for streams

[michaelklishin]

Much like quorum queues, streams generally assume that the (human) operator is explicit about replica management.

Over time, rabbitmq-queues add_replica was largely replaced by rabbitmq-queues grow, which
operates on groups of queues, and is more useful during automation.

However, there is no rabbitmq-streams grow, an equivalent for streams. This is because streams were not designed for environments where replicas dynamically change often enough to warrant such a command. But we can at least consider it one more time.

[SimonUnge]

While we are at it, perhaps add a shrink_all dito too (We already have the code for it with rabbit_stream_queue:delete_all_replicas) ?

If not started by someone, I can add a PR this weekend or so.

[michaelklishin]

There's been some opposition to dynamically managing stream replicas. We may revisit this at some point but right now it looks like this issue won't be considered or tackled in the foreseeable future.