Add action and condition for counting list items
>>> [!note] Migrated issue
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Reported by: [mxh](https://www.drupal.org/user/1124384)
Related to !161
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>We need to determine the number of items in a list.</p>
<h4 id="summary-steps-reproduce">Steps to reproduce</h4>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>For counting, we could implement an action that counts items on a specified Token and sets the count result into another token. For convenience, we could additionally implement a condition "number of items" extending from StringComparisonBase. That count action would only address "real" lists as we already have "Compare two scalar values" that may directly count a string length.</p>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<h3 id="summary-ui-changes">User interface changes</h3>
<h3 id="summary-api-changes">API changes</h3>
<h3 id="summary-data-model-changes">Data model changes</h3>
> Related issue: [Issue #3238206](https://www.drupal.org/node/3238206)
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