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/debug/HyprNotificationOverlay.cpp

@@ -36,6 +36,13 @@ CHyprNotificationOverlay::CHyprNotificationOverlay() {
     m_szIconFontName = fonts.substr(COLON + 2, LASTCHAR - (COLON + 2));
 }
 
+CHyprNotificationOverlay::~CHyprNotificationOverlay() {
+    if (m_pCairo)
+        cairo_destroy(m_pCairo);
+    if (m_pCairoSurface)
+        cairo_surface_destroy(m_pCairoSurface);
+}
+
 void CHyprNotificationOverlay::addNotification(const std::string& text, const CColor& color, const float timeMs, const eIcons icon, const float fontSize) {
     const auto PNOTIF = m_dNotifications.emplace_back(std::make_unique<SNotification>()).get();