Make email and phone optional for signing

Related issues

Closes #66 (closed)

Related to Frontend zu Pflichtfelder anpassen (Telefonnummer, E-Mail, Personenname) (#64) · Tickets · WG-ElectronicTransportDocuments / eCMR / eCMR Frontend · GitLab

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

Make email and phone optional for signing

* Make email and phone of ecmr members optional for signig.
* Personal name was aready optional.

Closes #66 (closed)