F grpc select

Summary

Implementation of the handling of Responses to SELECT queries.

Server implementation in caosdb-server!72 (merged)

Focus

The new code mainly wraps the protobuf "SelectQueryResult" message and it's members. The pattern used for the new ResultTable class is a delegator pattern which makes it possible to hide third-party headers from our public API.

Test Environment

No Tests here, just integration tests in caosdb-cppinttest!27 (merged)

Unit tests would not help a lot anyways because we have mainly wrapper classes around the protobuf messages.

Check List for the Author

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• All automated tests pass (failures in downstream libraries - julia and octave - are not caused by these changes. They also happen in the dev branch)
• Reference related issues
• Up-to-date CHANGELOG.md (or not necessary)
• 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 (or not necessary)
• 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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