Add WebSocket integration

[Process-ing]

Closes #233

This PR sets up Socket.IO in the frontend and creates a wrapper class to more effortlessly use the WebSocket communication.

To test this, run the backend on the feature/websockets branch add the following to index.tsx

import { sessionsSocket } from './api/socket'

// ...

sessionsSocket.connect()
sessionsSocket.on('response', data => {
    console.log(data);
});

// Send message to server
function sendMessage(message) {
    sessionsSocket.emit('test', message);
};

sessionsSocket.on('connect', () => {
    sendMessage('message');
});

setTimeout(() => {
    sessionsSocket.disconnect();
}, 1000);

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[tomaspalma]

LGTM 🚀