Implement Snode monitoring

[atcsecure]

To do:

Implement a Snode dashboard and monitoring solution, using Grafana + Prometheus.

Dashboard UI:

• identify what metrics snode ops would like to see
• define key metrics for alpha version
• UX specs and features
• design UX prototype
• dashboard build (TBD)

User installable script:

Create an executable installer script to guide the user through the install process eg:

Usage: ./snode-monitor.sh [--1|--2|--3|--4|--help]

Options:
--1     Step 1: Installs Prometheus
--2     Step 2: Installs Grafana
--3     Step 3: Installs `node_exporter` plugin (for server monitoring)n
--4     Step 4: Installs Blocknet Service Node dashboards
--help  Shows this message

_When run without any options, the script will install the latest version of the Blocknet dashboards._

Dashboard features:

VPS level:

• uptime
• CPU
• RAM
• disk space used
• list of dockers/wallets
• nav to each docker/wallet installed

Docker/wallet:

• disk space
• wallet block height
• explorer block height
• links to explorer
• connected peers per wallet
• latest wallet version and link to github

Alerts:

• TBD