Add a monochrome icon for LeakCanary.

Android 13 now supports themed app icons, including Monochrome Icons.
This change adds an additional Vector Drawable icon which will serve as the Monochrome Icon.
It also sets the Adaptive-Icon `monochrome` field.

This icon contains some elements of the logo slightly transparent for easier app identification.

leakcanary-android-core/src/main/res/drawable/leak_canary_icon_monochrome.xml

@@ -0,0 +1,26 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+  android:width="108dp"
+  android:height="108dp"
+  android:viewportWidth="108"
+  android:viewportHeight="108">
+  <path
+    android:fillAlpha="0.9"
+    android:pathData="M34.7,52.5l37,-15.2c0,0 0,0 0,0c-0.2,11.3 -7.4,25 -24.3,29.3c-2.1,-3.5 -8.1,-11.2 -12.9,-13.7C34.6,52.7 34.6,52.6 34.7,52.5z"
+    android:fillColor="#F5BD14"
+    android:fillType="evenOdd"/>
+  <path
+    android:fillAlpha="0.9"
+    android:pathData="M50.2,34.2l-2.8,7.8l-0.4,-0.5c-1.6,-2.1 -3.5,-3.9 -5.6,-5.4l4.9,-5.5l-0.3,6L50.2,34.2z"
+    android:fillColor="#F86932"/>
+  <path
+    android:pathData="M38.6,35.4c-6.2,0 -11.3,5.1 -11.3,11.3c0,0 0,0 0,0C27.3,53 32.4,58 38.6,58c6.2,0 11.3,-5.1 11.3,-11.3c0,0 0,0 0,0C49.9,40.5 44.9,35.4 38.6,35.4zM42.3,42.3l-1.5,0.5l0.6,1.7c0.1,0.4 -0.1,0.7 -0.4,0.9c-0.1,0 -0.1,0 -0.2,0c-0.3,0 -0.6,-0.2 -0.6,-0.5l-0.6,-1.7l-1,0.3c-0.4,0.1 -0.7,-0.1 -0.9,-0.4c-0.1,-0.4 0.1,-0.7 0.4,-0.9l1,-0.3l-0.5,-1.4c-0.1,-0.4 0.1,-0.7 0.4,-0.9c0.4,-0.1 0.7,0.1 0.9,0.4l0.5,1.4l1.5,-0.5c0.4,-0.1 0.7,0.1 0.9,0.4C42.9,41.8 42.7,42.2 42.3,42.3z"
+    android:fillColor="#FFCC32"/>
+  <path
+    android:pathData="M27.3,46.9c0.1,13.5 9.1,25.8 22.8,29.5c10.4,2.8 21.1,-0.1 28.5,-6.9c-3.3,0.2 -6.6,-0.1 -10,-1C60.5,66.3 54,61 50,54.1L27.3,46.9z"
+    android:fillColor="#FFCC32"
+    android:fillType="evenOdd"/>
+  <path
+    android:pathData="M80.4,42.3L42.7,55.2c0,0.1 -0.1,0.3 -0.2,0.4c4.6,2.8 10.1,10.9 11.9,14.5c3.6,-0.7 6.8,-1.8 9.7,-3.2c-1,-0.4 -2,-1 -2.9,-1.8L61,64.9c-0.3,-0.2 -0.3,-0.6 -0.1,-0.9c0.2,-0.3 0.6,-0.3 0.9,-0.1l0.2,0.2c1,0.9 2.3,1.6 3.6,1.9c0.4,-0.2 0.8,-0.4 1.1,-0.7c-0.6,-0.3 -1.2,-0.6 -1.8,-1l-0.2,-0.2c-0.3,-0.2 -0.4,-0.6 -0.2,-0.9c0.2,-0.3 0.6,-0.4 0.9,-0.2l0.2,0.2c0.7,0.5 1.5,0.9 2.3,1.2c0.4,-0.3 0.7,-0.5 1,-0.8c-0.2,-0.1 -0.4,-0.2 -0.6,-0.4l-0.2,-0.2c-0.3,-0.2 -0.4,-0.6 -0.2,-0.9c0.2,-0.3 0.6,-0.4 0.9,-0.2l0.2,0.2c0.3,0.2 0.6,0.4 0.9,0.6c6.6,-5.6 9.9,-13.3 10.5,-20.3C80.6,42.4 80.5,42.4 80.4,42.3z"
+    android:fillColor="#FFCC32"
+    android:fillType="evenOdd"/>
+</vector>

leakcanary-android-core/src/main/res/mipmap-anydpi-v26/leak_canary_icon.xml

@@ -2,4 +2,5 @@
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
   <background android:drawable="@color/leak_canary_white"/>
   <foreground android:drawable="@drawable/leak_canary_icon_foreground"/>
+  <monochrome android:drawable="@drawable/leak_canary_icon_monochrome" />
 </adaptive-icon>