Process bridgedb metrics

In collector#40016 (comment 2899995) @gk mentioned how we should map bridgedb metrics in the new database.

Talking with @meskio and @cohosh during the tor meeting we mentioned there was the possibility to export bridgedb metrics directly into the DB instead of generating a document that has to be stored by collector.

This makes sense especially if we plan to map all our past data into the DB and have a service that can generate documents based on specific queries instead of an archive with tarballs.

The current bridgedb tables are defined in https://gitlab.torproject.org/tpo/network-health/metrics/descriptorParser/-/blob/main/src/main/sql/bridgedb_metrics_tables.sql

As @gk pointed out though, we are missing some fields that we are not sure how to map into columns. At the same time, maybe there are other metrics we are not collecting or we could process in a way that makes more sense with what we want to track.

Besides collecting bridgedb metrics in sql, we could also consider which fields we could send to victoria metrics instead.