Take into account entity role for retrieval / use get_entity_by_name

Summary

Addresses https://gitlab.com/linkahead/linkahead-pylib/-/issues/123 and #198 (closed)
Container.retrieve now uses get_entity_by_name for retrieval of entities without id and matches the role if given.

Test-MR: caosdb-pyinttest!87 (merged)

Focus

• This is likely significantly slower than before, and makes a lot more requests for large Containers with entities without ids. Is this acceptable? If not, would an additional parameter to specify which behaviour is wanted be a usable compromise?
• To offset the performance hit, get_entity_by_id is not used. Is this ok?
• The manual query for file retrieval with a path was replaced by get_entity_by_path, is this likely to break anything?

Test Environment

Manual Tests

Check List for the Author

• All automated tests pass
• Reference related issues
• Up-to-date CHANGELOG.md (or not necessary)
• Up-to-date JSON schema (or not necessary)
• Appropriate user and developer documentation (or not necessary)
• Annotations in code (Gitlab comments)

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• Appropriate user and developer documentation (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?