[Feature] Manage roles/policy frontend form

[mawandm]

Description
Create a UI form for managing roles and policies.

Detail
The current method of adding roles and policies is too technical. In order to make it easier for create and manage policies, we need a form to manage roles and policies.

Acceptance Criteria

1. A form to add/edit a role's policies
2. The user should only need to select and click policies to add to the role.