Reduce dataspace/anchor lookups in CpsDataPersistenceService

- Remove unneeded calls to DataspaceRepository::getByName
- Remove unneeded calls to AnchorRepository::getByDataspaceAndName
- Refactor FragmentRepository

Issue-ID: CPS-1536
Signed-off-by: danielhanrahan <daniel.hanrahan@est.tech>
Change-Id: I2121f6247070ee4a7c000e06ec66a6278b758540
4 files changed