Check the short channel id between ldk and cln before passing down the value to ldk

A short channel id can be `000x00x00` or a sequence of bytes. See the definition of the short channel id on the spec https://github.com/lightning/bolts/blob/master/07-routing-gossip.md#definition-of-short_channel_id

_Originally posted by @vincenzopalazzo in https://github.com/tareknaser/barq/pull/29#discussion_r1720204519_

Start at the boundary where the short channel id is passed between CLN and LDK, then compare the accepted value with the Lightning specification's short_channel_id definition linked in the issue. Done means the value is checked before being passed to LDK, including the 000x00x00 form and byte-sequence form.

Written by the indexing model from the issue text.