feat: create mcmap.bin from BGP IPv4/IPv6 multicast channels

[T-X]

This would be helpful for us to immidiately monitor the BGP peerings for the IPv4/IPv6 multicast channels thanks to the "data" HTTP GET paramater, without needing to deploy an extra instance for now.

[T-X]

I couldn't get the CI running in my own fork yet, so the way I tested this was by manually going through (most) of the CI commands and then viewing the page locally.

I also couldn't verify if https://mrt.iedon.net/multicast4_latest.mrt.bz2 and https://mrt.iedon.net/multicast6_latest.mrt.bz2 exist due to missing permissions. But I tested this via https://mrt.collector.dn42/multicast4_latest.mrt.bz2 and https://mrt.collector.dn42/multicast6_latest.mrt.bz2 instead.