create endpoint to check if we are logged in / authoized

[ikaem]

as a dev, i need an endpoint that i can ping to

• check if i am authoized
• this will only check my access token provided
• it will return 200 or 401
• in case 200, it would also return auth response - with user id, user nickname and user name, or whatever is there

flow on client should be (mobile)

• this is called initially with stored access token
• if fail, it should try to ping refresh auth token (intercept response)
• we would get new access token if all good
• then try again the original request
• we would receive logged in user data