Move common custom data from stream-chat

Author: arnautov-anton

src/@types/stream-chat-common-custom-data.d.ts

@@ -0,0 +1,12 @@
+import 'stream-chat';
+
+declare module 'stream-chat' {
+  interface CustomUserData {
+    image?: string;
+  }
+
+  interface CustomChannelData {
+    image?: string;
+    subtitle?: string;
+  }
+}