Update quill_icon_theme.dart

Add padding to IconTheme

lib/src/models/themes/quill_icon_theme.dart

@@ -1,5 +1,5 @@
 import 'package:flutter/widgets.dart' show Color;
-
+import 'package:flutter/material.dart';
 import 'package:meta/meta.dart' show immutable;
 
 @immutable
@@ -11,7 +11,8 @@ class QuillIconTheme {
       this.iconUnselectedFillColor,
       this.disabledIconColor,
       this.disabledIconFillColor,
-      this.borderRadius});
+      this.borderRadius,
+      this.padding});
 
   ///The color to use for selected icons in the toolbar
   final Color? iconSelectedColor;
@@ -33,4 +34,7 @@ class QuillIconTheme {
 
   ///The borderRadius for icons
   final double? borderRadius;
+
+  ///The padding for icons
+  final EdgeInsets? padding;  
 }