Use Scheduler instead of asyncio.sleep on silence cog

`asyncio.sleep` doesn't provide us with the ability to stop that timer,
while in most of the cases, this is fine, there is a possibility that
channel will be unsilenced manually and silenced again, but this sleep from
the first silence will cancel the second (new) silence.
This will replace this `asyncio.sleep` with Scheduler which provides the
ability to cancel the unsilencing task when aborted manually.
That means we also have the ability to send a response if the channel is
not silenced and someone tries to unsilence it.

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