add new tab item action group, delegate history handle to action implementation

src/app/browser/window/tab/action.rs

@@ -0,0 +1,25 @@
+use gtk::{
+    gio::SimpleActionGroup,
+    glib::{uuid_string_random, GString},
+};
+
+/// [SimpleActionGroup](https://docs.gtk.org/gio/class.SimpleActionGroup.html) wrapper for `Tab` actions
+pub struct Action {
+    pub id: GString,
+    pub simple_action_group: SimpleActionGroup,
+}
+
+impl Default for Action {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl Action {
+    pub fn new() -> Self {
+        Self {
+            id: uuid_string_random(),
+            simple_action_group: SimpleActionGroup::new(),
+        }
+    }
+}