Send tx prototype

[hcheng826]

Multi-party ECDSA for Ethereum transaction prototype

4 components

1. Node.js server
   1. parse the tx data and send it to client Rust server
   2. get the response and send_rawTransaction
2. client Rust server
   1. send the tx data to service Rust server
   2. talk to state machine manager server to start the signing process
   3. return the signature value as response to Node.js server
3. service Rust server
   1. take the tx data and talk to state machine manager to complete the signature
4. state machine manager server