MAINT: rename filter to filter_by_identity

Summary

Rename the filter function to prevent confusion that it does not behave like standard filter functions

Test Environment

pipelines

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src/linkahead/common/models.py

@@ -349,6 +349,15 @@ class Entity:
     def pickup(self, new_pickup):
         self.__pickup = new_pickup
 
+    @property   # getter for _cuid
+    def cuid(self):
+        # Set if None?
+        return self._cuid
+
+    @property   # getter for _flags
+    def flags(self):
+        return self._flags.copy()   # for dict[str, str] shallow copy is enough
+
     def grant(
         self,
         realm: Optional[str] = None,
@@ -1342,7 +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))
@@ -3766,6 +3776,7 @@ class Container(list):
         """
         return _filter_entity_list_by_identity(self, pid=entity_id, 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.