Clean up eCMR Data Model. Remove all Sign-on-Glass Metadata entries as eSeals are mandatory for Sender and Carrier.

* Area 22: Remove Signature, as not needed for Sealing process.
* Area 23: Remove Signature, as not needed for Sealing process.
* TransportRole: Add new enumeration to define all roles of a road transport process as required for eCMR.
* Metadata: Add role to save role of sealing company. Rename to SealMetadata to make purpose more clear.

* Restructure SealedEcmr
- Rename to EcmrSeal
- Move **ecmr** to SealedDocument

* Restructure SealedDocument
-   Add entry **senderSeal** for storing the EcmrSeal (formely named SealedEcmr) for the Sender including the seal and its metadata (as SealMetadata)
-   Add entry **carrierSeal** for storing the EcmrSeal (formely named SealedEcmr) for the Carrier including the seal and its metadata (as SealMetadata)
-   Add entry **successiveCarrierSeal** for storing the EcmrSeal (formely named SealedEcmr) for the Successive Carrier including the seal and its metadata (as SealMetadata)
-   Add entry **consigneeSeal** for storing the EcmrSeal (formely named SealedEcmr) for the Consignee including the seal and its metadata (as SealMetadata)
-   Add **ecmr**(EcmrModel), was in SealedEcmr before

Co-authored-by: Benedikt Hilbert <benedikt.hilbert@rhenus.com>