Add benchmark for network with 4 peers

[s8sato]

Goal

Establish a standard for optimizations about TPS

• Provide the difference before and after the code change, rather than the absolute value
• A benchmark to publish official TPS will be left to another issue
  • 100 Peer Network for Testing #1230
  • Setup distributed test running in CI #1204

How to

• Add one to cargo bench
• Use test_network crate

What to be measured

TPS := (txs/block)/(block/sec)

• iroha_telemetry::metrics::Metrics has the source

Issue

Generate a series of transactions with some diversity and reproduce it

Related issues

• Add benchmark for network with 4 peers #1042
• 100 Peer Network for Testing #1230
• Setup distributed test running in CI #1204
• QA Testing #1590
• Introduce a high load test #1479
• Introduce a set of waiting peers #1225