Display custom debounce values from custom filters

[tw2113]

In the Autocomplete admin UI, if a given index has a filtered debounce time, show that as part of the row.

[tw2113]

includes/admin/partials/page-autocomplete-config.php around line 64

<?php if ( $index['debounce'] > 0 ) : ?>
<small>
<?php
printf(
	// translators: placeholder is the custom debounce value.
	esc_html__( 'Custom debounce timing: %s', 'wp-search-with-algolia' ),
	esc_html( $index['debounce'] )
);
?>
</small>
<?php endif; ?>

[tw2113]

PR: #511