SurfaceTintColor parameter added to control background color more clean

[yusufnadar]

Description

The surfaceTintColor parameter must be changed to see the same tone of color that is set for the background. Because the barrierColor value for the BottomSheet is defaulted to Colors.black54.
SurfaceTintColor can also be modified in WoltModalSheetThemeData for further customization.
Check how the white color looks on the background in the preview image.

Related Issues

Fix #139

Preview

Before	After

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• I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
• My PR includes tests for all changed/updated/fixed behaviors.
• All existing and new tests are passing.
• I updated/added relevant documentation (doc comments with ///).
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Breaking Change

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• Yes, this is a breaking change.
• No, this is not a breaking change.

[ulusoyca]

Thanks for the PR. The surfaceTintColor is also used in WoltStickyActionBarWrapper. Can you also do the changes there?

[ulusoyca]

It looks like the documentation I provided in the existing source code is wrong. Let's fix this here, and in the old place. Here is my suggestion:

  /// The color of the surface tint overlay applied to the material color
  /// to indicate elevation for the modal sheet page. The [surfaceTintColor] is applied to the 
  /// modal sheet background color, top bar color, and the sticky action bar wrapper colors.
  ///
  /// {@template flutter.material.material.surfaceTintColor}
  /// Material Design 3 introduced a new way for some components to indicate
  /// their elevation by using a surface tint color overlay on top of the
  /// base material [color]. This overlay is painted with an opacity that is
  /// related to the [elevation] of the material.
  ///
  /// If [ThemeData.useMaterial3] is false, then this property is not used.
  ///
  /// If [ThemeData.useMaterial3] is true and [surfaceTintColor] is not null and
  /// not [Colors.transparent], then it will be used to overlay the base [backgroundColor]
  /// with an opacity based on the [modalElevation].
  ///
  /// If [ThemeData.useMaterial3] is true and [surfaceTintColor] is null, then the default 
  /// [surfaceTintColor] value is taken from the [ColorScheme].
  ///
  /// See also:
  ///
  ///   * [ThemeData.useMaterial3], which turns this feature on.
  ///   * [ElevationOverlay.applySurfaceTint], which is used to implement the
  ///     tint.
  ///   * https://m3.material.io/styles/color/the-color-system/color-roles
  ///     which specifies how the overlay is applied.

[ulusoyca]