Making BottomTabBar horizontalscroll property available in typescript

[AsheeshSharma]

Hi, I was using this viewpager library in typescript but due to current implementation issues, the property of scrollenabled property was not accessible in IndicatorViewPager making it impossible to stop horizontal scrolling. I Have extended ViewPagerProps with IndicatorViewPagerProps to make it accessible to classes where it is being used. Please understand that it works fine in JS but when using TypeScript it throws an error as the scrollenabled property is not available in its props. Please approve the pull request so others can use it as well.