Added support to enlarge center option and keep fixed size for others#1

keiraperks wants to merge 3 commits intostefan_add-overlay-colorInsight-Timer/flutter_carousel_slider:stefan_add-overlay-colorfrom

khushboo-support-to-enlarge-center-keep-others-sameInsight-Timer/flutter_carousel_slider:khushboo-support-to-enlarge-center-keep-others-sameCopy head branch name to clipboard