Set up resource usage monitoring dashboard

[Raparker88]

We would like to monitor the resource usage on our application. This will help determine in the future how we scale our application with changing requests rates.

Steps:
implement a custom metric api_requests_total. Hint: go to middleware.py where there is already some logic to trace all requests coming in.

Set up a dashboard in grafana. This should include the rate of total requests per every one minute. It should also include the process_cpu_seconds_total metric automatically exported by django as a rate per minute.

This dashboard will give us insights into how CPU usage fluctuates with request rates