Collect host metrics from target nodes

[ThetaSinner]

When we run TryCP-based scenarios, we are running one control node and connecting to several targets that have TryCP and Holochain on them. We collect custom and host metrics from the control node but we only collect Holochain metrics from the target nodes, we want to extend this to include host metrics.

This allows us to keep track of the host resources that Holochain is using during tests. This is a useful signal for behavior changes in the Holochain implementation.

Depends on: #111

AC:

• Host metrics are collected and reported by Telegraf during the test
• Telegraf doesn't report scenario metrics during the run, this is done after
• The results analysis is updated to include host metrics with each scenario