Device agent to monitor entire device health, not just Node-RED stats

### Description

We've gotten requests from prospective customers that it would be helpful if our device agent provided a more holistic view of device health rather than just Node-RED specific data. This would negate the need for additional device software to view device health/resources outside of Node-RED instances.

https://app-eu1.hubspot.com/contacts/26586079/record/0-3/8877831883
https://app-eu1.hubspot.com/contacts/26586079/record/0-3/10054370019/

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate