Support for sql_exporter with pgMonitor extension

changelogs/fragments/361.yml

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+major_changes:
+  - sql_exporter - Add support for new PostgreSQL metrics collecting exporter: sql_exporter
+  - sql_exporter - Add support for directly connecting to PgBouncer to collect metrics
+  - pgmonitor-extension - Add support for using the PostgreSQL pgmonitor-extension to aid in metrics collection with sql_exporter
+  - pgmonitor-extension - Add more extensive support for materialized views and refreshed tables for expensive or custom metric queries
+  - postgres_exporter - Note that postgres_exporter is still supported but will be deprecated in a future version
+  - grafana - New Grafana minimum version is now 10.4. All dashboards have been updated to fix AngularJS deprecation warnings and re-exported from 10.4.
+  - grafana - Add new dashboards for sql_exporter support. New PostgreSQL Overview and PgBouncer direct metrics dashboards
+  - grafana - Organize packages to allow better choice of available Grafana dashboards 
+  - grafana - Remove top level general Overview dashboard