feat: add lock session protocol support (WIP)

diyac.c

@@ -9,6 +9,7 @@
 #include "cursor.h"
 #include "seat.h"
 #include "layer.h"
+#include "session.h"
 
 int main(int argc, char *argv[])
 {
@@ -121,6 +122,9 @@ int main(int argc, char *argv[])
      * https://drewdevault.com/2018/07/29/Wayland-shells.html.
      */
     wl_list_init(&server.views);
+    /**
+    * TODO: free these tree when finish
+    */
     server.view_tree = wlr_scene_tree_create(&server.scene->tree);
     server.xdg_popup_tree = wlr_scene_tree_create(&server.scene->tree);
 
@@ -134,6 +138,7 @@ int main(int argc, char *argv[])
     wl_signal_add(&server.layer_shell->events.new_surface,
                   &server.new_layer_surface);
 
+    diyac_init_session_lock(&server);
     diyac_init_cursor_manager(&server);
 
     /*