Handle connection tracking events in a separate process.

Connection tracking event handling may involve DB operations and closing of
connections (e.g. for vhost deletion).
Because gen_event handles all events in the same process - this may
cause message accumulation in the rabbit_event process and memory
accumulation.
Connection tracking process will only receive connection tracking
events and all other events will be dropped, freeing the memory.

Follow-up to #1722
[#164353033]

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