Add Active Storage

[a-barbieri]

It be great to use Active Storage rather than Carrierwave. This has several benefits.

To Do

1. Add Active Storage so Binda::File is able to manage files.
2. Create new model Binda::Media. This will let us deprecate previous way to manage files i.e. Binda::Asset. This model will be the bridge from several Binda::Component to a single Binda::File with the benefit of reusing previously uploaded content.
3. Create API in order to manage any media asynchronously.
4. Create a basic interface.