Added Template for Dockerized Equinox Telemetry

[ragiano215]

The purpose of this template is to allow a developer to quickly get set up with dashboards while running their Equinox /
Propulsion application(s) locally. This set-up uses Docker to allow one to reproducibly spin up sandboxed instances of
Prometheus and Grafana that come pre-wired and pre-provisioned with the canonical Equinox dashboards.

[bartelink]

This looks great, thanks for the care and writing a comprehensive README too.
I'll have a look at it when I get a chance later/tmrw

[bartelink]

As discussed @ragiano215, the TL;DR on the remaining work before this is released:

• split eqx vs propulsion dashboards
• add breakdown by group for propulsion_scheduler based dashboards in order to cater for apps with >1 scheduler within (also to be able to discriminate between multiple instances of pruners/archivers) re Update to use Propulsion 2.12.1 Prometheus wiring #114
• move Grafana JSON templates into a docker folder