[Enhancement] Cleanup sync

[thedroiddiv]

Currently the sync does too much things which can be separated out into their own process. It does

1. Uploads profile task
2. Downloads profile task
3. Updates payments information
4. Fetches all avatars of workers
5. Pushed any update to avatars
6. Pushes db updates
7. Fetches db updates
8. Downloads new input files
9. Deletes old files

And all these process happens for each avatar one by one. Simplifying sync could reduce the wait time significantly. To do so,

• [ ] Separate out the fetch avatar and update avatar. Avatar is updated as soon as it transitions to new state
• [ ] Submit task only submits, doesn't downloads new tasks neither it downloads
• [ ] Separate process to download new assignments, download cannot proceed without uploading the completed ones
• [ ] File IO handling could be separate process