Add benchmarks for go-header

[nashqueue]

Result of discussion with @Wondertan

The goal is to add benchmarks for various scenarios and testing for block time and size limits.

Option 1:

• Expand go-header metrics coverage in go-header
• Pull metrics into Granfana board
• Multiple implementations can use the same Grafana board

Option 2:

• Write the Knuu test that spins up the network and desired topology
• Call API needed to be measured like (produce and retrieve blocks or headers)
• Measure the time between calls
• Optionally make some reusable benchmarking tooling for Knuu