Implement the possibility of creating cloud VDSs without metadata pages
- Refactor fill3DVDSWithNoise/fill3DVDSWithBitNoise to use a common fillVolumeDataPages utility function so tests can easily fill VDSs with any kind of data and also customize the parameters for the VolumeDataPageAccessor.
- Implement the possibility of creating cloud VDSs without metadata pages by passing a chunkMetadataPageSize of 0 when creating the VolumeDataPageAccessor (not possible with VDS files).