Benchmark C# nodes setup with small block time

[AnnaShaleva]

1. Setup network on load stand: 7 C# CN + C# RPC node as Loader entry point.
2. Set block time to 3s per block.
3. Find maximum reachable TPS value in Workers bench mode.
4. Benchmark TPS/RPS/Errors values under several different Rate bench modes.
5. Repeat the same experiments with 1s per block.

We don't need a lot of measurments; we need to check whether it's possible to get relatively stable C# network with 3s/1s per block setting.