feat(Spotify): Add Unlock premium patch (#4644)

Co-authored-by: Nuckyz <61953774+Nuckyz@users.noreply.github.com>
Co-authored-by: Brosssh <tiabroch@gmail.com>

extensions/spotify/stub/build.gradle.kts

@@ -0,0 +1,17 @@
+plugins {
+    id(libs.plugins.android.library.get().pluginId)
+}
+
+android {
+    namespace = "app.revanced.extension"
+    compileSdk = 34
+
+    defaultConfig {
+        minSdk = 26
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+}

extensions/spotify/stub/src/main/AndroidManifest.xml

@@ -0,0 +1 @@
+<manifest/>

extensions/spotify/stub/src/main/java/com/spotify/remoteconfig/internal/AccountAttribute.java

@@ -0,0 +1,5 @@
+package com.spotify.remoteconfig.internal;
+
+public final class AccountAttribute {
+    public Object value_;
+}