Convertion between ContextEntity and ContextEntityKeyvalues

[djs0109]

Describe the solution you'd like
There are two formats of entity, i.e., ContextEntity and ContextEntityKeyValues. It will be good to have conversion methods (like to_keyvalues and to_normalized) locally.

entities: List[ContextEntity] = ...
entities_convert_keyvalues = [entity.to_keyvalues() for entity in entities]

entities_keyvalues: List[ContextEntityKeyValues] = ...
entities_convert_normalized = [entity_keyvalue.to_normalized() for entity_keyvaluein entities_keyvalues]

Additional context
Be aware that the ContextEntity inherits ContextEntityKeyValues. Therefore, the to_normalized() method must be deactivated in class.

[github-actions]

Branch 372-Convertion-between-ContextEntity-and-ContextEntityKeyvalues created!