[appinio_swiper] Code split

[ricardodalarme]

Description

Split the code into

• appinio_swiper
• appinio_swiper_controller
• appinio_unswipe_card
• enums
• typedefs

Based on

• https://github.com/appinioGmbH/flutter_packages/pull/57

[ricardodalarme]

If the first one is merged I'll rebase this one to adjust the branch