Proposed: Move ObjectRepositoryRoleProvider to a separate library

[visto9259]

Move Role/ObjectRepositoryRoleProvider.php, its factory and the corresponding test cases to a separate library to remove the the dependency on Doctrine.
The use of Doctrine is optional but yet a dependency on Doctrine is required to avoid any confusion and conflicts.

Suggested plan:

• Create a separate library for the Doctrine related role provider
• Deprecate the existing Role/ObjectRepositoryRoleProvider.php and remove in the future (release v2?)

[visto9259]

Given the wide usage of Doctrine, this is probably not a required enhancement.