feat(#2): add messy implementation for futures ws

[tiagosiebler]

Excuse the mess as this is just a very rough MVP/POC to get the futures WS hooked up. Not sure I'll manage to clean it up properly, but hopefully it's helpful should you wish to adopt it in a cleaner way as the pieces are all mostly functional.

Summary:

• ping/pong parsing/messaging needed changing, as the format is different for this ws
• request keys needed changing as they're not camel case
• the signature mechanism needed changing as it's slightly different
• the parsers need changing as they're not returning the same data format

Feel free to close this if you don't need this PR, I just wanted it noted down if it's a time saver in future! Thanks for the guidance you gave!

[zsojma]

Hi @tiagosiebler, thanks for the PR. It will definitely save me some time in the future! I really appreciate it