Allow property and parent lists to be filtered.

Summary

rename ParentList and PropertyList and add a filter function

Test Environment

unit tests

Check List for the Author

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• 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)
  • How do I use the software? Assume "stupid" users.
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• 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
• Add something on the filter to the user documentation
• 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?

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

unittests/test_entity.py

@@ -143,13 +143,7 @@ def test_parent_list():
     assert "not found" in str(ve.value)
     assert len(pl) == 2
 
-    # TODO also check other built-in list functions: insert, pop, clear, count
     # TODO also check pl1 == pl2
-    # TODO what is with RecordType(name='A', id=100) in pl? I.e., fitting name,
-    # but id of corresponding element in pl is None. Same of course for
-    # RecordType(name='C', id=101) in pl, i.e. fitting id, but name of element
-    # in pl is None.
-    # TODO what is with the ambiguous RecordType(name='A', id=101) in pl?