[Security] enhance Voters system

[Elorfin]

• Extend Symfony\Component\Security\Core\Authorization\Voter\Voter.

This will automatically enable the new CacheableVoter feature after the symony upgrade.

• Clean interface provided by Claroline\CoreBundle\Security\Voter\AbstractVoter.

  • Remove container injection.
  • Do not override symfony behavior. There is a lot of custom logic which is not really needed at all.
  • Move helpers (isToolGranted, isAdmin, etc.) into traits and only use it where needed.

• Create an OrganizationManagerVoter to grant all accesses.

• Create a WorkspaceManagerVoter to grant all accesses.

• Declare Claroline\CoreBundle\Security\Voter\AbstractVoter as abstract service

For now we use the _instanceof feature in yml config. But it must be copied into each voter file which is tedious/hard to maintain.

• Remove VIEW attribute (it's never used).