F merge id with resolved entity

Summary

One half of the fix for caosdb-crawler#113 (closed). Introduces a merge_id_with_resolved_entity parameter to the apiutils.merge_entities function, that allows to identify an id value of a reference property with an entity that has this id.

Focus

Check whether you can find cases that the new unit test doesn't cover.

Test Environment

Unit test should be sufficient, but you can also run the new int test from caosdb-crawler!141 (merged) and verify that this enhancement resolves the bug.

Check List for the Author

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• All automated tests pass
• Reference related issues
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• Appropriate user and developer documentation (or not necessary)
  • How do I use the software? Assume "stupid" users.
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• 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?

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