Adding Identity Collection API and Finalize CreateIdentityCommand

- Added Pagerfanta for pagination
- Updated Doctrine ORM/DBAL/DoctrineBundle for FULLTEXT index support
- Created Doctrine Type for Institution
- Created Doctrine Query FunctionNode to enable MATCH () AGAINST () in SQL
- Expanded the CreateIdentityCommand and Event handling
- Updated Identity Projector to project complete readmodels
- Created Search API for Identity Collection
- Added the required migrations