What to use this over flutter `showModalBottomSheet`?
`showMaterialModalBottomSheet` supports closing bottoms sheets by dragging down even if there is a scrollview inside.
`showModalBottomSheet` won't work correctly with scrollviews
#### Generic params for all modal bottom sheets
| Param | Description |
|---|---|
|bool expand = false| The `expand` parameter specifies id the modal bottom sheet will be full screen size or will fit the content child|
|bool useRootNavigator = false| The `useRootNavigator` parameter ensures that the root navigator is used to display the bottom sheet when set to `true`. This is useful in the case that a modal bottom sheet needs to be displayed above all other content but the caller is inside another `Navigator`. |
|bool isDismissible = true| The `isDismissible` parameter specifies whether the bottom sheet will be dismissed when user taps on the scrim. |
|Color barrierColor | The `barrierColor` parameter controls the color of the scrim for this route |
|bool enableDrag = true| The `enableDrag` parameter specifies whether the bottom sheet can be dragged up and down and dismissed by swiping downwards. |
|AnimationController secondAnimation| The `secondAnimation` parameter allows you to provide an animation controller that will be used to animate push/pop of the modal route. Using this param is advised against and will be probably removed in future versions |
|bool bounce = false| The `enableDrag` parameter specifies if the bottom sheet can go beyond the top boundary while dragging |
#### Material params
The optional `backgroundColor`, `elevation`, `shape`, and `clipBehavior` parameters can be passed in to customize the appearance and behavior of material bottom sheets.
Improved showModalBottomSheet that support scroll and drag at the same time.