chanbackup: even if they enable experimental-peer-storage, check peers #6072
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Seems like LND is hanging up on receiving these messages, even though they're odd :(
So, when a peer connects, check if it supplies or wants peer backup (even if it doesn't support both, it shouldn't hang up, and I didn't want to separate the two paths).
And when we go to send our own, updated backup, check features before sending.
Fixes: #6065
Changelog-EXPERIMENTAL:
experimental-peer-storage
caused LND to hang up on us, so only send to peers which support it.