[TASK] Add FileManager persistence layer

This Forks from TYPO3\Flow\ to Cognifire\BuilderBase\
Persistence\Repository -> Persistence\AbstractPackageRepository
Persistence\PersistenceManagerInterface -> Persistence\FileManagerInterface
Persistence\AbstractPersistenceManager -> Persistence\AbstractFileManager
Persistence\Generic\PersistenceManager -> Persistence\FileManager

Also, renames Cognifire/BuilderBase/Package -> Cognifire/BuilderBase/Domain