Add flag and cuid getters to Entity

Summary

Added new protected property getters to Entity.
Needed for caosdb-advanced-user-tools!126 (merged)

Test Environment

No testing should be necessary, access should be read-only - does the dict always have strings as values?

Check List for the Author

• All automated tests pass
• Reference related issues
• Up-to-date CHANGELOG.md
• 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)
• In-code documentation and comments are up-to-date.

src/linkahead/common/models.py

@@ -1351,7 +1351,8 @@ class Entity:
                 else:
                     dt_str = xml2str(self.datatype.to_xml(visited_entities=visited_entities.copy()))
                     # Todo: Use for pretty-printing with calls from _repr_ only?
-                    # dt_str = dt_str.replace('<', 'ᐸ').replace('>', 'ᐳ').replace(' ', '⠀').replace('"', '\'').replace('\n', '')
+                    # dt_str = dt_str.replace('<', 'ᐸ').replace('>', 'ᐳ').replace(' ', '⠀').replace(
+                    # '"', '\'').replace('\n', '')
                     xml.set("datatype", dt_str)
             else:
                 xml.set("datatype", str(self.datatype))
@@ -3767,6 +3768,7 @@ class Container(list):
         """
         return _filter_entity_list(self, pid=pid, name=name, entity=entity,
                                    conjunction=conjunction)
+
     @staticmethod
     def _find_dependencies_in_container(container: Container):
         """Find elements in a container that are a dependency of another element of the same.