Investigate persisting route prefixes learned from BMP in Elasticsearch

Let's start figuring out how we can persisting the routes in Elasticsearch.

From the BMP messages we should be able to build objects like:
https://github.com/SNAS/openbmp/blob/master/docs/MESSAGE_BUS_API.md#object-unicast_prefix-openbmpparsedunicast_prefix

We want these to be persisted in Elasticsearch and queryable from Grafana - we can use the Elastiscearch datasource for the time being.