ENH: Retrieving single entities works on the mex side.

Summary

• Retrieve single entity
• Retrieve multiple entities
• Sending queries

Focus

Please have a look at the unit tests and integration tests for usage instructions.

• Does the entity mapping to Octave look OK?
• Does the error handling look OK?
• Does everything behave like ti should?

Test Environment

• make install You can now load the package with load caosdb.
• make test Run the unit tests
• Start LinkAhead in the grpc branch with the demo profile.
• make -C ../caosdb-octaveinttest test Run the integration tests.

Check List for the Author

Please, prepare your MR for a review. Be sure to write a summary and a focus and create gitlab comments for the reviewer. They should guide the reviewer through the changes, explain your changes and also point out open questions. For further good practices have a look at our review guidelines

• All automated tests pass -> Integration tests pass locally (with default profile), Entity insertion is needed for running on the pipeline
• Reference related Issues -> https://gitlab.indiscale.com/caosdb/customers/lfpb/management/-/issues/383
• 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 spezifications? Are they satisfied?

For further good practices have a look at our review guidelines.