chore(android): support AGP 9 built-in Kotlin

Author: hiroshihorie

android/build.gradle

@@ -22,7 +22,11 @@ allprojects {
 }
 
 apply plugin: "com.android.library"
-apply plugin: "kotlin-android"
+
+def agpMajor = com.android.Version.ANDROID_GRADLE_PLUGIN_VERSION.tokenize(".")[0] as int
+if (agpMajor < 9) {
+    apply plugin: "kotlin-android"
+}
 
 android {
     if (project.android.hasProperty("namespace")) {
@@ -36,10 +40,6 @@ android {
         targetCompatibility = JavaVersion.VERSION_1_8
     }
 
-    kotlinOptions {
-        jvmTarget = JavaVersion.VERSION_1_8
-    }
-
     sourceSets {
         main.java.srcDirs += "src/main/kotlin"
         test.java.srcDirs += "src/test/kotlin"
@@ -68,3 +68,9 @@ android {
         }
     }
 }
+
+kotlin {
+    compilerOptions {
+        jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_1_8
+    }
+}