Implement suspend in permission control

[junwei0117]

In the current implementation, there are only two functions to control the permission, Grant and Revoke , but we need to consider suspend a user temporarily.

Except output:

• Implement user suspend in DropKit smart contract

Implement user suspend API:

• /permission/suspend/table/owner
• /permission/suspend/table/maintainer
• /permission/suspend/table/viewer

[YingHan-Chen]

I want to clarify the requirement.

The suspend feature may have the following forms.

• Each quest suspends one user's permission to a specific role in a table
  • Admins need to maintain users' permission to all tables and corresponding roles themself
• Each quest suspends one user's permission to a specific table
  • Admins need to maintain users' permission to all tables themself
• Each quest suspends one user's permission to all tables
  • This method is much close to group permission control. A group consists of permissions to multiple tables
  • If we want to do so, I think we can implement group permission control directly.