Resolve "Get ECMR Carrier Details without Authentication"

Related issues

Closes #78

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

Add an Endpoint to get carrier information

using a handler-methode in AnonymousController and the EcmrShareService

Closes #78