internal: fix a few asan reported leaks on exit of hyprland (#5852)

* notifications: free cairo images on destruction

asan reports a leak on exit if we dont free the image we created in the
draw function. add a destructor and free images on exit.

* compositor: destroy wlroots types on exit

there are a few types not being destroyed on exit and causing a leak on
exit in wlroots reported by asan, add those.

* cursormgr: ensure we destroy cursor mgr on exit

add a destructor and call wlr_xcursor_manager_destroy on the manager on
destruction, leak reported by asan.

* keybindmgr: free state and keymap

add missing keymap_unref on creation, and add a destructor and free the
state on exit. leak reported by asan.

* skeyboard: add destructor and free state

free the state on destruction of keyboard, reported as leak by asan

src/managers/KeybindManager.hpp

@@ -58,6 +58,7 @@ struct SParsedKey {
 class CKeybindManager {
   public:
     CKeybindManager();
+    ~CKeybindManager();
 
     bool                                                              onKeyEvent(wlr_keyboard_key_event*, SKeyboard*);
     bool                                                              onAxisEvent(wlr_pointer_axis_event*);