Implement Coinbase API features

[scawful]

Currently, the CBP.hpp inside of include/Interface is blank after copying methods from the old implementation. The goal is for it to be more akin to the TDA.hpp in the same folder.

This means using a Client class that handles the API requests using curl and Boost.Beast for HTTP/TLS and WebSocket connections respectively, as well as using a Parser class that sorts the json data into an object the program can later use. This is a very general feature/issue so it can be expanded on based on the demands of the Coinbase API.

This feature would require editing the following files

• include/Interface/CBP.hpp
• src/Services/CoinbasePro/Client.cpp
• src/Services/CoinbasePro/Parser.cpp

Since I started this project, Coinbase actually merged their API into one for Exchange/Cloud so the specification of "Pro" isn't super necessary but I believe there's still a distinction in which account you access based on the endpoint URL (though I could be wrong as this code hasn't been ran/tested in months)

To test your code you can go to tests/ServiceTestSuite/CBP.cpp and invoke any of the objects besides the actual static interface header. That should be used merely as a means of calling client/parser/socket code.

You can find information about the https://docs.cloud.coinbase.com/exchange/docs