chore: Separate extensions by app (#3905)

extensions/shared/library/build.gradle.kts

@@ -0,0 +1,21 @@
+plugins {
+    id("com.android.library")
+}
+
+android {
+    namespace = "app.revanced.extension"
+    compileSdk = 34
+
+    defaultConfig {
+        minSdk = 23
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+}
+
+dependencies {
+    compileOnly(libs.annotation)
+}