Add support for custom form-element supporting entity_reference
>>> [!note] Migrated issue
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Reported by: [stmh](https://www.drupal.org/user/35538)
Related to !89
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>Currently there is no easy way to use Tagify as autocomplete inside a custom form for a entity_reference form-element.</p>
<p>Here's an example of how I use the existing entity_reference type:</p>
<pre>$form['user_reference'] = [<br> '#type' => 'entity_autocomplete',<br> '#target_type' => 'user',<br> '#title' => t('User'),<br> '#description' => t('Enter a user name or email address.'),<br> '#default_value' => $current_user, // optional, a user object for pre-populating the field<br>];</pre><p>It would be great to use tagify for this problem scenario, which is currently not possible, as the Tagify settings are stored inside a key/value store and retrieved in the autocomplete-handler, which is hard to mimic w/o a fully fledged field-widget.</p>
<p>Slightly related to #3352158</p>
> Related issue: [Issue #3352158](https://www.drupal.org/node/3352158)
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