Move all gradle files into folder app

Decouple java and native projects

app/build.gradle.kts

@@ -1,5 +1,11 @@
-tasks.register("clean") {
+plugins {
+    id("MagiskPlugin")
+}
+
+tasks.register("clean", Delete::class) {
+    delete(rootProject.layout.buildDirectory)
+
     subprojects.forEach {
-        dependsOn(":app:${it.name}:clean")
+        dependsOn(":${it.name}:clean")
     }
 }