latency-collector: contributor-provided ripeatlas probes #973
Description
The internet latency collector only uses Atlas anchor probes because they have better availability characteristics than probes provided by other Atlas users. RIPE Atlas has anchor probe coverage for all of our target mainnet-beta sites except for Salt Lake City and Buenos Aires. We could use other users' probes in these cities that do not have anchor probes, but there's no guarantee of those probes' availability.
Let's add a feature to internet-latency-collector that allows us to configure a list of DoubleZero contributor-provided probe IDs. If this feature proves popular it will make sense to store probe IDs on-chain, but at this stage let's do something simple (load IDs from command line flag or config file).