[6.x] Listings

[jasonvarga]

Where #11787 introduced a new way to create publish forms, this PR adds a new simplified way to create listings.

You pass all the props into the top level Listing component. Many props are optional.

<Listing
    :url="requestUrl"
    :preferences-prefix="`collections.${collection}`"
    allow-bulk-actions
    v-model:columns="columns"
    v-model:sort-column="sortColumn"
    v-model:sort-direction="sortDirection"
    v-model:selections="selections"
/>

Without passing anything into the slot, you will get an entire layout filled with appropriate components, such as a table, filters, search, pagination, and a column customizer.

If you do pass something to the slot, you will have control over the layout.

<Listing ...>
    <Presets />
    <div class="flex items-center gap-3">
        <Search />
        <Filters />
        <ColumnPicker />
    </div>
    <Table />
</Listing>

This PR also makes some other tweaks:

• Resets confirmable actions once completed so we dont need the global reset event bubblage
• ItemActions url prop is optional, which allows nothing to be passed and you get the contents of what you passed as a slot. Useful for when you're prepending actions without any real actions, and you don't want to code a whole separate dropdown for that.
• Item actions can lazy load. We do that in listings on hover. Now the actions for every item don't need to be returned in the listing response.
• Modal triggers use as-child prop to prevent button inside a button.
• Collection action routes were changed - the collection itself didn't need to be in the route. It should be one url to be used for any collection.
• Action::forBulk() will treat it as non-bulk if there's only a single selection.
• FieldsetPolicy got a delete method to fix it never passing. Probably since we tweaked the Gate::before() super check.