feat: 官方消息UI

module/im/src/main/res/drawable/im_official_message_bubble_bg.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="@color/white" />
+    <corners android:radius="12dp" />
+</shape>

module/im/src/main/res/layout/layout_session_message_official_image_text.xml

@@ -4,6 +4,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
+    android:background="@drawable/im_official_message_bubble_bg"
     app:constraint_layout_round_corner="12dp">
 
     <com.adealink.frame.image.view.NetworkImageView