feat: Refactor Response class and add new initialization methods

packages/edge_runtime/lib/src/utils.dart

@@ -1,25 +1,12 @@
 import 'dart:typed_data' show ByteBuffer, Uint8List;
 
 Object? convertBody(Object? body) {
-  if (body == null) {
-    return null;
-  }
-
-  if (body is String) {
-    return body;
-  }
-
-  if (body is Uint8List) {
-    return body;
-  }
-
-  if (body is ByteBuffer) {
-    return body;
-  }
-
-  throw ArgumentError.value(
-    body,
-    'body',
-    'Body must be an nullable instance of [String], [ByteBuffer] or [Uint8List].',
-  );
+  return switch (body) {
+    String || Uint8List || ByteBuffer || null => body,
+    _ => throw ArgumentError.value(
+        body,
+        'body',
+        'Body must be a nullable instance of [String], [ByteBuffer] or [Uint8List].',
+      ),
+  };
 }

packages/edge_runtime/pubspec.yaml

@@ -5,7 +5,7 @@ repository: https://github.com/invertase/dart_edge/tree/main/packages/edge_runti
 version: 0.0.4+1
 
 environment:
-  sdk: ">=2.18.5 <3.0.0"
+  sdk: ">=3.0.0 <4.0.0"
 
 dependencies:
   freezed_annotation: ^2.2.0