Client requests for resize/move are already processed by
handle_request_configure. I tested that with this program: https://gist.github.com/emersion/cc4909ba3581928871192822fc96d00b
It's the compositor's responsibility to detect mouse clicks near window borders and resize windows, if the compositor wants to have this feature. This is different from xdg shell (since xdg shell clients draw their own decorations).
view->resize that will be used to force resize with meta+rclick.