Enable sharing sealed eCMR with other instances

Related issues

Enable sharing sealed eCMR with other instances

Closes #41 (closed)

Acceptance criteria

• Implemented code changes don't diverge from the related issue.
• Documentation reflects the status quo after merge.
• Version number is incremented according to SemVer. (Snapshot versions are not merged/released.)
• Only released versions of dependencies are used (i.e. no snapshot versions).
• Pipeline still works.
• GitLab issue is up-to-date.

If necessary, the following sections have been updated:

• Swagger
• Readme.md
• Documentation

Proposed squash commit message

Enable sharing sealed eCMR with other instances

* add restfule endpoints for importing and exporting ecmrs
* enable sealing of ecmrs for exporting
* enable verify of resecives ecmrs for importing
* add saving recevied ecmrs and updating received information

Co-authored-by: Gebel, Lisa <lisa.gebel@iml.fraunhofer.de>
Co-authored-by: Krämer, Björn <bjoern.kraemer@iml.fraunhofer.de>
Co-authored-by: Leveling, Jens <Jens.Leveling@iml.fraunhofer.de>
Co-authored-by: Burczyk, Niklas <niklas.burczyk@iml.fraunhofer.de>

Closes #41 (closed)