transition EmojiPicker to use a primary constructor

lib/src/widgets/emoji_picker.dart

@@ -9,36 +9,25 @@ import "package:material_emoji_picker/src/controllers/emoji.dart";
 import "package:material_emoji_picker/src/models/emoji.dart";
 import "package:material_emoji_picker/src/models/emoji_category.dart";
 
-class EmojiPicker extends HookConsumerWidget {
-  const EmojiPicker({
-    this.prependCategories = const IList.empty(),
-    this.appendCategories = const IList.empty(),
-    required this.onSelection,
-    this.onFreeText,
-    this.includeDefaultEmoji = true,
-    this.itemSize = 56,
-    this.searchHint = "Search emoji",
-    super.key,
-  });
-
-  final IList<EmojiCategory> prependCategories;
-  final IList<EmojiCategory> appendCategories;
+class const EmojiPicker({
+  final IList<EmojiCategory> prependCategories = const .empty(),
+  final IList<EmojiCategory> appendCategories = const .empty(),
 
   /// Called with the emoji that was selected.
-  final FutureOr<void> Function(Emoji emoji) onSelection;
+  required final FutureOr<void> Function(Emoji emoji) onSelection,
 
   /// If set, the search text can be submitted as is, calling this with it.
-  final FutureOr<void> Function(String text)? onFreeText;
+  final FutureOr<void> Function(String text)? onFreeText,
 
   /// Whether to show the default unicode emoji after [prependCategories],
   /// e.g. false for a sticker picker of only custom categories.
-  final bool includeDefaultEmoji;
+  final bool includeDefaultEmoji = true,
 
   /// The width and height of each item in the grid.
-  final double itemSize;
-
-  final String searchHint;
-
+  final double itemSize = 56,
+  final String searchHint = "Search emoji",
+  super.key,
+}) extends HookConsumerWidget {
   @override
   Widget build(BuildContext context, WidgetRef ref) {
     final selectedCategory = useState<int>(0);