feat: add useful extensions and RPadding Widget

add r Extension to EdgeInsets, BorderRadius and Radius

+import 'package:flutter/material.dart';
+import 'package:flutter/rendering.dart';
+import 'package:flutter_screenutil/src/size_extension.dart';
+
+import 'size_extension.dart';
+
+class RPadding extends SingleChildRenderObjectWidget {
+  /// Creates a adapt widget that insets its child.
+  ///
+  /// The [padding] argument must not be null.
+  const RPadding({
+    Key? key,
+    required Widget child,
+    required this.padding,
+  }) : super(key: key, child: child);
+
+  /// The amount of space by which to inset the child.
+  final EdgeInsets padding;
+
+  @override
+  RenderPadding createRenderObject(BuildContext context) {
+    return RenderPadding(
+      padding: padding is REdgeInsets ? padding : padding.r,
+      textDirection: Directionality.maybeOf(context),
+    );
+  }
+}
+
+class REdgeInsets extends EdgeInsets {
+  /// Creates adapt insets from offsets from the left, top, right, and bottom.
+  REdgeInsets.fromLTRB(double left, double top, double right, double bottom)
+      : super.fromLTRB(left.r, top.r, right.r, bottom.r);
+
+  /// Creates adapt insets where all the offsets are `value`.
+  ///
+  /// {@tool snippet}
+  ///
+  /// Adapt height-pixel margin on all sides:
+  ///
+  /// ```dart
+  /// const REdgeInsets.all(8.0)
+  /// ```
+  /// {@end-tool}
+  REdgeInsets.all(double value) : super.all(value.r);
+
+  /// Creates adapt insets with symmetrical vertical and horizontal offsets.
+  ///
+  /// {@tool snippet}
+  ///
+  /// Adapt Eight pixel margin above and below, no horizontal margins:
+  ///
+  /// ```dart
+  /// const REdgeInsets.symmetric(vertical: 8.0)
+  /// ```
+  /// {@end-tool}
+  REdgeInsets.symmetric({
+    double vertical = 0,
+    double horizontal = 0,
+  }) : super.symmetric(vertical: vertical.r, horizontal: horizontal.r);
+
+  /// Creates adapt insets with only the given values non-zero.
+  ///
+  /// {@tool snippet}
+  ///
+  /// Adapt left margin indent of 40 pixels:
+  ///
+  /// ```dart
+  /// const REdgeInsets.only(left: 40.0)
+  /// ```
+  /// {@end-tool}
+  REdgeInsets.only({
+    double bottom = 0,
+    double right = 0,
+    double left = 0,
+    double top = 0,
+  }) : super.only(
+          bottom: bottom.r,
+          right: right.r,
+          left: left.r,
+          top: top.r,
+        );
+}

@@ -48,3 +48,30 @@ extension SizeExtension on num {
   Widget get verticalSpacingRadius =>
   Widget get verticalSpacingRadius =>
       ScreenUtil().setVerticalSpacingRadius(this);
       ScreenUtil().setVerticalSpacingRadius(this);
 }
 }
+
+extension EdgeInsetsExtension on EdgeInsets {
+  /// Creates adapt insets using r [SizeExtension].
+  EdgeInsets get r => copyWith(
+        top: top.r,
+        bottom: bottom.r,
+        right: right.r,
+        left: left.r,
+      );
+}
+
+extension BorderRaduisExtension on BorderRadius {
+  /// Creates adapt BorderRadius using r [SizeExtension].
+  BorderRadius get r => copyWith(
+        bottomLeft: bottomLeft.r,
+        bottomRight: bottomLeft.r,
+        topLeft: topLeft.r,
+        topRight: topRight.r,
+      );
+}
+
+extension RaduisExtension on Radius {
+  /// Creates adapt Radius using r [SizeExtension].
+  Radius get r => this
+    ..x.r
+    ..y.r;
+}