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.
  • How do I develop or debug the software? Assume novice developers.
• 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.

src/linkahead/common/models.py

@@ -2598,8 +2598,6 @@ class PropertyList(list):
 
 
 class ParentList(list):
-    # TODO unclear why this class is private. Isn't it use full for users?
-
     def _get_entity_by_cuid(self, cuid):
         '''
         Get the first entity which has the given cuid.