feat: Implement new space view

lib/pages/new_space.dart

@@ -0,0 +1,43 @@
+import 'package:matrix/matrix.dart' as sdk;
+import 'package:fluffychat/pages/views/new_space_view.dart';
+import 'package:future_loading_dialog/future_loading_dialog.dart';
+import 'package:fluffychat/widgets/matrix.dart';
+import 'package:flutter/material.dart';
+import 'package:matrix/matrix.dart';
+import 'package:vrouter/vrouter.dart';
+
+class NewSpace extends StatefulWidget {
+  @override
+  NewSpaceController createState() => NewSpaceController();
+}
+
+class NewSpaceController extends State<NewSpace> {
+  TextEditingController controller = TextEditingController();
+  bool publicGroup = false;
+
+  void setPublicGroup(bool b) => setState(() => publicGroup = b);
+
+  void submitAction([_]) async {
+    final matrix = Matrix.of(context);
+    final roomID = await showFutureLoadingDialog(
+      context: context,
+      future: () => matrix.client.createRoom(
+        preset: publicGroup
+            ? sdk.CreateRoomPreset.public_chat
+            : sdk.CreateRoomPreset.private_chat,
+        creationContent: {'type': RoomCreationTypes.mSpace},
+        visibility: publicGroup ? sdk.Visibility.public : null,
+        roomAliasName: publicGroup && controller.text.isNotEmpty
+            ? controller.text.trim().toLowerCase().replaceAll(' ', '_')
+            : null,
+        name: controller.text.isNotEmpty ? controller.text : null,
+      ),
+    );
+    if (roomID.error == null) {
+      VRouter.of(context).to('/rooms/${roomID.result}/details');
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) => NewSpaceView(this);
+}