migrate server to web3 version 1.0

[fbielejec]

Problem

Migrating to web3 1.0 would allow use to use infura node for the deployment and runtime of districts, removing the necessity to maintain our own nodes and reducing the CPU usage / memory footprint of AWS instances.

Implementation

Migrate district-server-web3 and all the proxy server libraries/modules depending on it. Use websockets over JSON-RPC http requests for communication.

Acceptance Criteria

Rules for the future PR to be accepted.

Notes

List of server libraries depending on web3:

• district-server-web3-events
• district-server-smart-contracts
• ...

Future Steps

Migrate UI libraries.