Add basic static testing
>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3563017. --> Reported by: [theodorosploumis](https://www.drupal.org/user/869224) >>> <h3 id="summary-problem-motivation">Basic testing</h3> <p>- Add gitlab CI yml (see issue <a href="https://www.drupal.org/project/human_decimal/issues/3459523">3459523</a>)<br> - phpstan<br> - phpcs<br> - cspell</p> > Related issue: [Issue #3459523](https://www.drupal.org/node/3459523)
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