Beefy full client

[musnit]

Quick test of a beefy client that does full signature verification instead of 2-step interactive random protocol, just for interest sake - likely won't merge

Results:

• Running flow with 200 validators: Tx successful - gas used: 2343853
• Running flow with 400 validators: Tx successful - gas used: 4235531
• Running flow with 667 validators: fail, out of gas
• Running flow with 1000 validators: fail, out of gas