[Item] collect item-notes to a new item-note and add a link to the main note

[windingwind]

Author: @windingwind
Discuss: #86

${await new Promise(async (r) => {
  const newNote = new Zotero.Item("note");
  newNote.libraryID = topItem.libraryID;
  newNote.parentID = topItem.id;
  newNote.setNote(
    `<div data-schema-version="8">
    <h2>${topItem.getField('title')}</h2>
    ${Zotero.Items.get(item.getNotes()).map(_note => `<p>
      <a href="${Zotero.Knowledge4Zotero.knowledge.getNoteLink(_note)}">
        ${_note.getNoteTitle()}
      </a>
    </p>`).join('\n')}
    </div>`
  );
  await newNote.saveTx();

  let res = `<p>
    <a href="${Zotero.Knowledge4Zotero.knowledge.getNoteLink(newNote)}">
      ${newNote.getNoteTitle()}
    </a>
  </p>`;
  r(res);
})}