Add addSite with list to rebuild

[darkdh]

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).

fix #4586

Auditors: @bsclifton

Test Plan:

1. Import bookmarks from other browsers or html file
2. The imported bookmarks should show in "Bookmarks" menu

[bsclifton]

Looks great! 👍

[bbondy]

thanks!