Add possibility to use the app also with `Text as List`

[marcomontalbano]

Would be nice to use this app with Text as List:

https://github.com/commercelayer/contentful-app/assets/1681269/d1256bef-25ec-439e-9471-39ff2e44630f

cc: @acasazza @malessani

[IgnacioNMiranda]

Hello! can we get an answer on this? @acasazza @malessani Some docs out there specify that this app can be used with Short Text, List fields so we can choose more than 1 sku in the same field. It's not really the case though as @marcomontalbano exposed here