As an admin i want to be able to ban/unban users

[emil476m]

• When an admin clicks on a user they should get a ban button
• When an admin bans a user the MUST give a ban reason and it will log who banned the user
• Make a api call to backend for banning / unbanning a user
• Refactor search so only admins can find banned users when searching for them
• Make a list of banned users that only admins have access to
• There should be an unban button beside the name of users in the banned list that only admins should be able to click
• make test for the api call