Use Prometheus drop-in database engines

[jb3]

This is a drop-in change that allows the django-prometheus package to export metrics detailing statistics on database usage within the application.

There are no other changes required and this is completely transparent to the rest of the application, the engine is just a passthrough to the underneath postgresql engine.

[netlify[bot]]

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[coveralls]

coverage: 100.0%. remained the same when pulling a5cbe4943645259189ec47e69b5042a274c8a824 on jb3/monitoring/prometheus-db-metrics into 19d761242b7184fec48a30f58fce8de18bab892a on main.