feat: improve resources_monitoring for OOM & OOD monitoring (#16241)

As requested for [this
issue](https://github.com/coder/internal/issues/245) we need to have a
new resource `resources_monitoring` in the agent.

It needs to be parsed from the provisioner and inserted into a new db
table.

coderd/database/migrations/000289_agent_resource_monitors.down.sql

@@ -0,0 +1,2 @@
+DROP TABLE IF EXISTS workspace_agent_memory_resource_monitors;
+DROP TABLE IF EXISTS workspace_agent_volume_resource_monitors;