Add ability to manage and grant IAM permissions as policy

app/models/iam/Permission.model.js

@@ -0,0 +1,23 @@
+const { Model } = require('flitter-orm')
+
+class PermissionModel extends Model {
+    static get schema() {
+        return {
+            active: { type: Boolean, default: true },
+            target_type: String,
+            permission: String
+        }
+    }
+
+    async to_api() {
+        return {
+            _id: this.id,
+            id: this.id,
+            active: this.active,
+            target_type: this.target_type,
+            permission: this.permission,
+        }
+    }
+}
+
+module.exports = exports = PermissionModel