Bulk operations for projects

[magicznyleszek]

When selecting multiple projects in My Projects route, we need some bulk operations to be possible:

• delete
• archive
• unarchive

Back end notes

New endpoint: POST request to /api/v2/assets/bulk/:

1. Some assets (every asset you own or you can manage)

   {"payload": {"asset_uids": ["auid_1", ..., "auid_n"], "action": "archive|delete|unarchive"}}

2. All your assets

   {"payload": {"confirm": true, "action": "archive|delete|unarchive"}}

[noliveleger]

@magicznyleszek FYI, I have update the back-end notes because it changed a little since our last discussion.