add message showing original timestamp of moved messages

[laralove143]

the bot is able to clone the message except its timestamp, which will be replaced with the time the message was moved

suggested solution:

append a message to the moved messages that includes info on the original timestamps in the format {message link}: originally posted at <t:{timestamp}>, with a button delete that deletes the message (only usable by the command author)

example (-- shows message boundary):

{moved message 1}

--

{moved message 2}

--

{meta information}