[5.x] Add Horizon command to clear queue

[paras-malhotra]

Resubmission of #890

Adds a Horizon command to clear queues. The way this is different from the Framework's queue:clear command is that it also deletes the jobs from the recent_jobs and pending_jobs sorted sets and Horizon job hash.

Instead of looping through recent jobs in PHP, I've added a Lua script to do this in a more efficient manner. This is backwards-compatible as it checks if the RedisQueue class has the clear method, so it will show a user-friendly error message for Laravel versions prior to 8.4.