Add option to dynamically enable bottom sheet drag for a single page

[ulusoyca]

Don't merge this PR before #44

Summary

This pull request introduces a new feature that enhances the behavior of the WoltModalSheet library by allowing the enabling or disabling of drag-to-dismiss functionality for the bottom sheet on a per-page basis. The primary change is the addition of the enableDragForBottomSheet property within the WoltModalSheetPage class.

Changes

• Added a new property enableDragForBottomSheet to the WoltModalSheetPage class.
• Enhanced the WoltBottomSheetDragHandle to be conditionally displayed based on the enableDragForBottomSheet property.
• Added a new use case to the playground example app to demonstrate how to dynamically enable/disable drag for modal sheet.
• Updated documentation and examples to demonstrate the usage of the new feature.

Use Case

This feature addition addresses a common use case where dynamic conditions dictate whether a bottom sheet can be dismissed by dragging or not. By providing this per-page option, developers can create more tailored and flexible user experiences, enabling or disabling the drag-to-dismiss behavior based on specific context and requirements.

Example

WoltModalSheetPage(
  enableDragForBottomSheet: shouldEnableDrag, // Enable or disable drag-to-dismiss
  // ... other page properties ...
)

dynamic_property.mp4

[TahaTesser]

Unless there is another enableDrag property in the package. I'd suggest just enableDrag.
The current name is too verbose IMO. The documentation should be enough to explain what enable drag is for.

See https://master-api.flutter.dev/flutter/material/BottomSheet/enableDrag.html

[ulusoyca]

Thanks, removed 868dd80 and 219fc21

[TahaTesser]

Since this is already being used. Short documentation will be helpful.

[ulusoyca]

added docs here: 219fc21