multi: start asking for update timestamps in QueryChannelRange

This commit also adds a new `protocol.no-timestamp-query-option` option
to disable the new behaviour.

sample-lnd.conf

@@ -1272,6 +1272,9 @@
 ; closing.
 ; protocol.no-any-segwit=false
 
+; Set to disable querying our peers for the timestamps of announcement
+; messages and to disable responding to such queries
+; protocol.no-timestamp-query-option=false
 
 ; Set to enable support for the experimental taproot channel type.
 ; protocol.simple-taproot-chans=false