[Delivers #47720831 #47720617] Refactor CloudFiles Constants and Helper classes

https://www.pivotaltracker.com/story/show/47720831
https://www.pivotaltracker.com/story/show/47720617

### Changes
- Refactored the __CloudFilesHelper__ class into 2 new classes/interfaces
    - (I)CloudFilesValidator
    - (I)CloudFilesMetadataProcessor
- Moved the constants from the __CloudFilesConstants__ into the __CloudFilesProvider__ class
- Made a few syntax corrections