fix: revert to base pyramid_jwt implementation using a custom cookie serializer

Arnaud Vergnet requested to merge topic/default/auth-cookie-fix into branch/default

Reverts to the base pyramid_jwt implementation but with a custom serializer which simply returns the given value. Needed as the JWT token is already base64 encoded.

This fixes authentication issues using the cubicweb_web login forms.

Edited by Arnaud Vergnet

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