Improve form integration

[jpzwarte]

• Implement reset & submit behavior in <button> when there is only an <sl-form> parent present
• Implement submit behavior in <sl-text-field> when there is only an <sl-form> parent present
• Add sl-reset and sl-submit events on <sl-form>
• Fix bug where resetting a form did not clear the validation messages
• Add closestElementComposed utility method to shared package

Fixes #1566

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[anna-lach]

Can you please add changeset? :)