[feature request] Randomize PersistentKeepalive

[John Smith]

There are some applications where you do not want a listener to know that a
channel is being kept alive and no information is being transmitted.

Perhaps the ideal solution would be to add an option to the wg tool to send
a keepalive packet, preferably of arbitrary size within some range. A
script could then be used to keep the channel alive in a manner. Would be
cleaner than sending something else through that may require further action
by the peer.
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