[Grafana] Configure Grafana dashboards as code

[oshadura]

Best news of this year from FOSDEM 2020 talk by Grafana Labs:
https://grafana.com/blog/2020/02/26/how-to-configure-grafana-as-code/

cc: @vgvassilev @eguiraud @stwunsch

[stwunsch]

That looks great! 🥳