Fix comma in string (non-delimiter) creates multiple terms

I have reworked autocomplete validation to use custom static function that imitates Drupal\Component\Utility\Tags::explode but uses delimiter that we specify in the form element. This way it works for new and existing terms.

Automatically closed - issue fixed for 2 weeks with no activity.

Thanks, Andrew, for following on this issue.

Better to keep using the Drupal Core Autocomplete Validator to work with Drupal 10 and Drupal 11
Having custom validator will bring more issues ( reverted )

Committing the patch from #6

✅ Released autocomplete_deluxe-2.0.4 →

Automatically closed - issue fixed for 2 weeks with no activity.