[Feature Request] Add duration Prop to Automatically Dismiss v-alert

[3aluw]

Problem to solve

Currently, v-alert components remain visible until manually dismissed, requiring developers to implement a setTimeout() to hide the alert after a certain period. This can lead to repetitive code.

Proposed solution

Introduce a duration prop to the v-alert component. This prop accepts a number representing the duration (in milliseconds) for which the alert should remain visible before automatically closing
usage example :

<v-alert :duration="5000" text=" This alert will automatically close after 5 seconds."/>

[eben-roux]

This would be super useful. An indicator if the countdown would also be nice.

I implemented something similar when toying with interim components while waiting for Vuetify 3 to support data tables :)

https://shuttle-npm.github.io/shuttle-vue3/components/alert.html

[eldardada]

Opened #22947 for this.