Provide support for data producer identifier during registration (CPS-1964 1)

- Added support for the dataProducerIdentifier to be added,
and updated from blank to something once
- The dataProducerIdentifier is persisted in the DB

Issue-ID: CPS-2105
Signed-off-by: JvD_Ericsson <jeff.van.dam@est.tech>
Change-Id: I1c230be8f9402154a761e8c2ba4d8a6331965b3c
16 files changed