add plugin host permission

app/src/main/AndroidManifest.xml

@@ -2,6 +2,14 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
 
+    <permission
+        android:name="app.revanced.manager.permission.PLUGIN_HOST"
+        android:protectionLevel="signature"
+        android:label="@string/plugin_host_permission_label"
+        android:description="@string/plugin_host_permission_description"
+        />
+
+    <uses-permission android:name="app.revanced.manager.permission.PLUGIN_HOST" />
     <uses-permission android:name="android.permission.QUERY_ALL_PACKAGES"
         tools:ignore="QueryAllPackagesPermission" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

app/src/main/res/values/strings.xml

@@ -6,6 +6,9 @@
     <string name="cli">CLI</string>
     <string name="manager">Manager</string>
 
+    <string name="plugin_host_permission_label">ReVanced Manager plugin host</string>
+    <string name="plugin_host_permission_description">Used to control access to ReVanced Manager plugins. Only ReVanced Manager has this.</string>
+
     <string name="dashboard">Dashboard</string>
     <string name="settings">Settings</string>
     <string name="select_app">Select an app</string>

downloader-plugin/src/main/java/app/revanced/manager/plugin/downloader/Constants.kt

@@ -0,0 +1,3 @@
+package app.revanced.manager.plugin.downloader
+
+const val PLUGIN_HOST_PERMISSION = "app.revanced.manager.permission.PLUGIN_HOST"

example-downloader-plugin/src/main/AndroidManifest.xml

@@ -12,6 +12,7 @@
         <activity
             android:name=".InteractionActivity"
             android:exported="true"
+            android:permission="app.revanced.manager.permission.PLUGIN_HOST"
             android:theme="@android:style/Theme.DeviceDefault" />
 
         <meta-data