Throughput pricing

### Description

We currently charge only for instances and a platform fee. There are much richer value-based pricing models available. This work is to enable us to charge based on usage in far more ways that we currently do.

This issue is to investigate the feasibility of measuring and billing based on the following, incomplete list:
- The total number of messages sent per instance and per team? (Would it be valuable to do so?)
- The number of messages sent/received by a particular type of node?
- The number of connections per instance and per team?
- The amount of CPU or memory used by an instance?
- The number of places where a dashboard is displayed?

### Epic/Story

_No response_

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

I have provided an initial effort estimate