Benchmarks! about multi-party-ecdsa

[omershlo]

Here is a short to do list. This list should be covered for both 2p and multi party protocols

1. measure keygen time
2. measure signing time
3. measure verification time
4. measure signatures per second
5. check if (4) can be improved using batching
6. locate bottlenecks in computation
7. check if (6) can be improved using code/algorithm change

repeat the list for: (A) 2P and Multi party protocols (B) different types of elliptic curves (C) without ser/des and with local network