[LE Audio] Broadcast Sink UI

- Add dialog for Broadcast and find broadcast source

 - Add Activity for find broadcast source

Bug: 228274114
Test: Manual test
Change-Id: I830efc3514fc42aaa4e53f491ed3a7459bd9bb41

res/drawable/broadcast_button_outline.xml

@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2022 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<inset xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:androidprv="http://schemas.android.com/apk/prv/res/android"
+    android:insetTop="6dp"
+    android:insetBottom="6dp">
+    <ripple android:color="?android:attr/colorControlHighlight">
+        <item android:id="@android:id/mask">
+            <shape android:shape="rectangle">
+                <solid android:color="@android:color/white"/>
+                <corners android:radius="24dp"/>
+            </shape>
+        </item>
+        <item>
+            <shape android:shape="rectangle">
+                <corners android:radius="24dp"/>
+                <solid android:color="@android:color/transparent"/>
+                <stroke android:color="?androidprv:attr/colorAccentPrimaryVariant"
+                    android:width="1dp"
+                    />
+                <padding android:left="16dp"
+                    android:top="8dp"
+                    android:right="16dp"
+                    android:bottom="8dp"/>
+            </shape>
+        </item>
+    </ripple>
+</inset>