[Feat]: Misc. sync improvements

[widavies]

• Move cloud sync to background service
• Option to not transfer content
• Actually delete deleted items
• Archive support
• Better resistance to any problems from failing mid sync

[github-actions]

Community Note:

• Please vote on this issue by adding a 👍 reaction to the original issue to help the community and developers prioritize this request
• Please do not leave "+1" or other similar comments that do not add relevant new information or questions
• If you are interested in working on this issue or have submitted a pull request, please leave a comment