Refactor socket.io endpoints to seperate files and add better error checking

[h1divp]

Like the recent express api refactor #270 , we would like to also move the socket endpoints in server/index.ts to files in their own folder.

For this, please create a folder called server/src/sockets and find a way to break up the socket connections. If you are familiar with socket.io/web sockets and know about related error handling best practices, we would really appreciate your help with this issue. If not, please familiarize yourself with websocket documentation while working on this issue.

[AaronGibson2]

I would like to work on this.