Summary

Implements update for a single entity

See https://gitlab.indiscale.com/caosdb/customers/lfpb/management/-/issues/392

Focus

• Updating entities works like this: Retrieve an entity, copy it and put it in the update transaction.
• ResultSet has an iterator now
• I privatated SetId and SetVersionId (nobody should ever need to change it, because Entities which are to be updated have to be retrieved first anyway.)
• More fine-grained TransactionStatus (INITIAL -> GO_ON -> READY -> EXECUTE -> SUCCESS/ERROR) and corresponding StatusCodes

Test Environment

Use with server branch f-grpc-f-update

Check List for the Author

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• All automated tests pass
• Reference related Issues
• Up-to-date CHANGELOG.md
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there specifications? Are they satisfied?

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