[RFC] The "before" command

[liuggio]

Would be great to add a command that will be executed once per channel before the other commands (of the same channel)...
eg. create one storage for channel like https://github.com/liuggio/fastest#setup-the-database-before

We have to decide if we should move this logic to the client side or spawn 'd rise a special event...

[EmanueleMinotto]

An expansion of the events set sounds better to me:

• for us is always the same logic (also for a possible "ending" command)
• for the developer is just another event to observe