feat: add scrollToStart and scrollToEnd API for text-area

[AbdullahGheith]

Description

The PR introduces scrollToStart and scrollToEnd methods for the text-area component.

Followed by:

• feat: add scrollToStart and scrollToEnd API for TextArea flow-components#6041

Fixes vaadin/flow-components#6042

Type of change

• Bugfix
• Feature

Checklist

• I have read the contribution guide: https://vaadin.com/docs/latest/contributing/overview
• I have added a description following the guideline.
• The issue is created in the corresponding repository and I have referenced it.
• I have added tests to ensure my change is effective and works as intended.
• New and existing tests are passing locally with my change.
• I have performed self-review and corrected misspellings.
• I have not completed some of the steps above and my pull request can be closed immediately.

Additional for Feature type of change

• Enhancement / new feature was discussed in a corresponding GitHub issue and Acceptance Criteria were created.

[vursen]

FYI: Snippet to test the feature:

<script type="module">
  import '@vaadin/text-area';

  const textarea = document.querySelector('vaadin-text-area');

  const scrollToTop = document.querySelector('.scrollToTop');
  scrollToTop.addEventListener('click', () => {
    textarea.scrollToStart();
  });

  const scrollToBottom = document.querySelector('.scrollToBottom');
  scrollToBottom.addEventListener('click', () => {
    textarea.scrollToEnd();
  });
</script>

<button class="scrollToTop">Scroll to top</button>
<button class="scrollToBottom">Scroll to bottom</button>

<vaadin-text-area label="Feedback" style="max-height: 150px"></vaadin-text-area>

[sonarcloud]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[vaadin-bot]

This ticket/PR has been released with Vaadin 24.4.0.alpha9 and is also targeting the upcoming stable 24.4.0 version.