Task: Upload Task Model

[MiMiTooU]

A table to persist upload tasks
contains:

1. id : int
2. path: str
3. uploader : str
4. state : int

there may be more of attributes for uploading, like descriptions, title, tags and so on, need more discussion

expecting two layers of such attributes, one layer catches the info from the webhook, another layer gets more info from the listener