Remove Flask-Security library due to performance issues

[jpowie01]

Expected Behavior

Calling /api/v1/core/status with authentication header should be as fast as possible.

Actual Behavior

Requests with authentication header take waaaaaaay too long!

Steps to Reproduce the Problem

1. Log in:

$ curl -X POST --header 'Content-Type: application/json' --header 'Accept: application/json' -d '{ \ 
   "email": "admin%40medtagger.com", \ 
   "password": "medtagger1" \ 
 }' 'http://localhost:51000/api/v1/auth/sign-in'

So now, you know your token:

{
  "token": "WyIxIiwiJDUkcm91bmRzPTUzNTAwMCRWZnppNmVtT1BDZERWQnhSJHFJb0FscGF4T3huczJ5QWI0R0lpQXhNL1ZhbnBSeTVxdmguSUNkOEtQNC4iXQ.DZf7RQ._ktW6C3CJ0uumUm-YVR8LVDj3po"
}

2. Call API without header:

$ curl -X GET --header 'Accept: application/json' 'http://localhost:51000/api/v1/core/status' -w %{time_connect}:%{time_starttransfer}:%{time_total}

As you can see it was really fast:

{"success": true}
0.015452:0.020297:0.020431%

3. Call API with token header:

$ curl -X GET --header 'Accept: application/json' --header 'Authentication-Token: WyIxIiwiJDUkcm91bmRzPTUzNTAwMCRWZnppNmVtT1BDZERWQnhSJHFJb0FscGF4T3huczJ5QWI0R0lpQXhNL1ZhbnBSeTVxdmguSUNkOEtQNC4iXQ.DZf7RQ._ktW6C3CJ0uumUm-YVR8LVDj3po' 'http://localhost:51000/api/v1/core/status' -w %{time_connect}:%{time_starttransfer}:%{time_total}

And it takes ages... (1.5 second!):

{"success": true}
0.014786:1.452852:1.452908

Additional comment

Issue on Flask-Security:
pallets-eco/flask-security-3.0#731

Blog post about proper authentication:
https://blog.miguelgrinberg.com/post/restful-authentication-with-flask

An implementation that uses tokens:
https://gist.github.com/gouthambs/0a509faf231cff3cdec7