Issue #3568233: Add support for loading Drupal JavaScript libraries via custom elements

  • Add attachment tracking to CustomElement class (getAttachments, setAttachments, addAttachments)
  • Create DrupalLibraryElementGenerator service to generate drupal-library-* elements
  • Library elements include resolved JS file paths with dependencies in correct load order
  • Add kernel tests for attachment tracking and library element generation

Co-Authored-By: Claude Opus 4.5 noreply@anthropic.com

Closes #3568233

Edited by Ciprian Stavovei

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