Replication service for Influxdb 3.0

This is an entirely different implementation. The end result should be relatively the same, but this is via the InfluxDB 3 processing engine, which is a Python VM embedded within the database. Writes are somewhat durable because of the presence of a write-ahead log that can be read from after a reboot if something goes down, but I wouldn’t say this is identical to the idea of a durable message queue.