Enable per-user feature permission control for by admins

[bobbai00]

Feature Summary

Let admins control the permissions of using some features for users. One motivation is: for feature described in #3935, only trusted users should have the capability of using the feature.

Proposed Solution or Design

• Store the permission info in the database: Add a column in user table called permission. This field is a json type and can store the permission the user has.
• Introduce the frontend dashboard for admins: Add a new column in admin user dashboard. Admins can toggle the per-user permission via the dashboard

Impact / Priority

(P2)Medium – useful enhancement

Affected Area

No response