Add invalidate path hook

[dottodot]

This adds a hook after successful on-demand revalidation. This is useful if you then need to clear a cache such as cloudfront.

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[shadcn]

I like this. I can definitely see this being useful.

However, since the revalidation API is still experimental in Next.js, I'd like to let this sit for a while and decide on how best to approach this.

Do we want hooks or events? Should we use a plugin system?

<?php

class ArticleRevalidation extends RevalidationBase {

    function preValidation();

    function postValidation();

}

What do you think?

[theodorosploumis]

I think Events is better since we are on Drupal 9.x at the moment.

[dottodot]

Could this be revisited now that revalidation API is stable?

[shadcn]

@dottodot Definitely. Thanks for the ping. I'll start looking into this.

[dottodot]

@shadcn Has there been any progress on this or decision on a route to take. Can always submit a new pr using the preferred approach if not.

[shadcn]

@dottodot Yes. I've implemented a plugin + event subscribers for handling revalidation. WIP here: #301

I'll push to a dev release and we can test it.