Add a boolean property to disable `fit: StackFit.expand`

[PranayD1807]

I need the carousel in my use case to adjust its height based on its children's minimum height. Specifically, I have a list view displaying cards that I want to animate using the carousel. Since I cannot set a fixed height for the cards, I can meet my requirements by removing fit: StackFit.expand from the code snippet provided in the flutter_custom_carousel package. Introducing a boolean property like isDense would be helpful for this purpose.

https://github.com/gskinnerTeam/flutter_custom_carousel/blob/daebf7f3603f821640f93d0ffea2db85ff2822e7/lib/src/custom_carousel.dart#L409C5-L412C7