[api_wrapper]: refactor

[rrickgauer]

Transform the ApiWrapper into a base class and break out all the related functions into separate classes:

• [x] users
• [x] products
• [x] product images
• [x] product availabilities
• [x] search products
• [x] listings
• [x] payments
• [x] requests
• [x] locations
• [x] other

[rrickgauer]

Maybe make an abstract class with these methods:

• get
• post
• put
• delete