Add tooling for automated throughput testing

[wojcik91]

Add tooling required for automated sidecar throughput testing, where throughput is understood as number of node events processed within a unit of time.

• create a mock node with the ability to respond to binary port requests and generate a stream of fake node events
• run the sidecar along the mock node and measure the number of processed events by monitoring sidecar metrics
• add a wrapper script for running the test scenario
• add instructions for the whole process