Update session handler and load current user

[marcusesa]

Description

Update session handler from native handler to redis handler and allow the loading of current user based on UsernamePasswordToken.

Motivation and context

In order to know who is the user logged in qedu-hub, we added some new configurations to load the current user using session content storage in Redis.

Main Changes

• Install and register SncRedisBundle and Predis.
• Update session handler from native to redis.
• Configure user encoder.
• Configure database user loader.
• Add user entity.
• Add user repository.

Reference

• Symfony documentation.
• SncRedisBundle documentation.

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Screenshots