Add ability to filter `selector` collections (e.g. hide inactive products)

[Daaaaad]

The selector field type only accepts a string (e.g. 'Product', 'Category').
AdminThemeManagerController::getCollectionAction() then creates a raw PrestaShopCollection:

$psCollection = new PrestaShopCollection($collection, $id_lang);

No extra filter is applied, so inactive / offline products appear in the dropdown.
On production sites this often leads to blocks displaying unavailable products.

Current behaviour

'product' => [
    'type'       => 'selector',
    'collection' => 'Product',
    'selector'   => '{id} - {name}',
],

Typing any query shows both active and inactive products.

Expected / requested behaviour

• Either: built-in filter so only active products are returned (active = 1).
• Or: accept custom conditions, e.g.

'options' => [
    'where' => 'active = 1 AND visibility IN ("both","catalog")'
]

Thanks for considering!