feat: fix #150 - JSDoc comments from mixin class ignored

[psyko-gh]

Fix #150

Retrieve information from JSDoc when using mixins.

export function SlotMixin(superClass) {
  /**
   * @slot foo - i was hoping CEM would pick up on this, so i could document the slot just once, on the mixin.
   */
  class SlotElement extends superClass {
    renderSomeSlot() {
      return html`<slot name="foo"></slot>`;
    }
  }

  return SlotElement;
}

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