[bug] Remove custom classes

[vpchung]

Error encountered

Not an error per se, but more of a concern on possible future confusion between classes from the synapseclient and classes created for cnb-tools. cnb-tools should instead act more of an extension by being a functional programming interface.

CC: @BryanFauble

Expected behavior

See this module as a reference on what an "extensions" package would look like.

[BryanFauble]

An interesting way to think about this "extensions" package as well is to try and develop it with the ability to "plugin" another set of configuration files to drive your specific use case.

For example, If I were to change this create_folders function to meet that use-case I would write it in such a way that you could define the folder/sub-folder structure how you'd like it to look (But provide a default configuration too).