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Extend Geo Node Status with information in replication slots

Brett Walker requested to merge 4179-geo-replication-status into master

Exposes a new model PgReplicationSlot that can query information on PostgreSQL replication slots.

The number of used/unused/total slots can be queried, as well as the number of bytes that, overall, the replication slots are reserving in WAL (indicating there could potentially be a problem).

These values are also added to the GeoNodeStatus object.

Are there points in the code the reviewer needs to double check?

The PgReplicationSlot model

Why was this MR needed?

We want to expose more information about replication slots in the Geo status screen, and this is the first part of that.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Related to #4179 (closed)

Edited by Brett Walker

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