Split Package in various target

[mackoj]

This will give more control on which part of generated code you want to use:

• only Models (no need for Alamofire)
• Models + Requests (no need for Alamofire)
• Models + Request + Client (required Alamofire)

All of this is usable with or without dynamic library(it will now work with my dependencies that are used in Xcodegen and are imported in multiples frameworks)

This should change nothing at all to most people except the removal of timeline.

This should simplify the migration out of Alamofire because now there is only one part of the code to focus on to remove it.

This should simplify refactoring of a part of the template if needed.

Issue

• This force me to remove Timeline feature of Alamofire.

[mackoj]

I would love to have some comment from @yonaskolb about this.

[mackoj]

This not ready for review yet I have to add missing helper to build a URLRequest from an APIRequest.