android: Enable Kotlin support

src/android/app/build.gradle

@@ -1,4 +1,7 @@
-apply plugin: 'com.android.application'
+plugins {
+    id 'com.android.application'
+    id 'org.jetbrains.kotlin.android'
+}
 
 /**
  * Use the number of seconds/10 since Jan 1 2016 as the versionCode.
@@ -20,6 +23,10 @@ android {
         targetCompatibility JavaVersion.VERSION_11
     }
 
+    kotlinOptions {
+        jvmTarget = '11'
+    }
+
     lint {
         // This is important as it will run lint but not abort on error
         // Lint has some overly obnoxious "errors" that should really be warnings
@@ -115,6 +122,7 @@ android {
 }
 
 dependencies {
+    implementation 'androidx.core:core-ktx:1.9.0'
     implementation 'androidx.appcompat:appcompat:1.6.1'
     implementation 'androidx.exifinterface:exifinterface:1.3.6'
     implementation 'androidx.cardview:cardview:1.0.0'