Introduce SliverWoltModalSheetPage and WoltModalSheetPage classes to construct modal sheet pages

[ulusoyca]

Description

This PR marks a significant enhancement to the WoltModalSheet library with the introduction of two new classes, SliverWoltModalSheetPage and WoltModalSheetPage. Alongside these additions, the PR also includes updates to the README file, ensuring necessary documentation and guidance for these new features.

This PR also addresses the issue: #72

Introduction of New Classes:

SliverWoltModalSheetPage: This class is designed for creating complex and dynamic modal sheet pages using Flutter's Sliver widgets. It enables advanced use cases requiring custom scroll behaviors and efficient rendering for large or complex lists.

WoltModalSheetPage: A simpler alternative for modal sheets with straightforward content, this class automatically wraps a single widget in a SliverToBoxAdapter. It's perfect for single-widget content or basic layouts without the need for elaborate scrolling effects.

Enhanced README File:

The README has been updated to include detailed sections on the usage of SliverWoltModalSheetPage and WoltModalSheetPage. These sections offer clear instructions, benefits, and example code snippets, providing developers with all the information needed to utilize these classes effectively. Additional emphasis has been placed on the distinction between these two classes, guiding developers on choosing the appropriate class based on their specific requirements.

Example Application Update:

The example application has been updated to demonstrate the practical implementation of both classes. This includes showcasing the capabilities of SliverWoltModalSheetPage with sliver effects and the straightforward usage of WoltModalSheetPage.

multiple_slivers.mp4

[TahaTesser]

Suggested change

	Widget? pageTitle,
	double? navBarHeight,
	Widget? topBarTitle,
	super.pageTitle,
	super.navBarHeight,
	super.topBarTitle,

Use super for these and follow up properties

  WoltModalSheetPage({
    required this.child,
    super.pageTitle,
    super.navBarHeight,
    super.topBarTitle,
    super.heroImage,
    super.heroImageHeight,
    super.backgroundColor,
    super.hasSabGradient,
    super.sabGradientColor,
    super.enableDrag,
    super.forceMaxHeight = false,
    super.isTopBarLayerAlwaysVisible,
    super.hasTopBarLayer,
    super.scrollController,
    super.stickyActionBar,
    super.leadingNavBarWidget,
    super.trailingNavBarWidget,
    super.topBar,
  }) : super(mainContentSlivers: [SliverToBoxAdapter(child: child)]);

[TahaTesser]

Update follow up properties for super too

[TahaTesser]

Also there some analyzer issues