Add beforeLeave hook on router

[DJafari]

in some case we want doing a async work before inertia changed page

for example : i have a form in modal, i want after form submited and result is success, before inertia navigate me to another page, hide my modal dialog

with this pr i can doing it by passing onBeforeLeave to VisitOptions

thanks

[jesusantguerrero]

Isn't onBefore hook covering that use case?

[Adesin-fr]

Not sure if this is the same that onBefore, but I'd like to use async on the onBefore event, and it is currently not awaiting it !