sliver state handler padding support

lib/widgets/sliver_state_handler.dart

@@ -11,15 +11,17 @@ class SliverStateHandler<T extends CoreProvier> extends SliverList {
   final bool enableEmptyState;
   final Widget? emptyState;
   final Widget? placeholder;
+  final EdgeInsets? itemPadding;
   SliverStateHandler({
     Key? key,
+    required this.state,
     required this.builder,
     required this.childCount,
+    this.itemPadding,
     this.placeholder,
     this.emptyState,
     this.enableEmptyState = false,
     this.onRefresh,
-    required this.state,
   }) : super(
           key: key,
           delegate: SliverChildBuilderDelegate(
@@ -31,9 +33,15 @@ class SliverStateHandler<T extends CoreProvier> extends SliverList {
                 return emptyState;
               }
               if (state.appState == AppState.busy) {
-                return placeholder;
+                return Padding(
+                  padding: itemPadding ?? const EdgeInsets.all(0),
+                  child: placeholder,
+                );
               }
-              return builder(context, state, index);
+              return Padding(
+                padding: itemPadding ?? const EdgeInsets.all(0),
+                child: builder(context, state, index),
+              );
             },
             childCount: state.appState == AppState.idle
                 ? childCount