Intergrate the keyValues endpoints with the normal ones

[djs0109]

Is your feature request related to a problem? Please describe.
Updating entities with keyValues form is now supported by update_entity_key_values and update_entity_attributes_key_values. However, the request options like append , overrideMetadata , forcedUpdate are not implemented

Describe the solution you'd like
We should consider intergrade the keyvalues support into the normal functions, which would make the code easier to maintain

[djs0109]

Check official docs: https://fiware-orion.readthedocs.io/en/master/orion-api.html#update-attribute-value-put-v2entitiesentityidattrsattrnamevalue

[github-actions]

Branch 281-Intergrade-the-keyValues-endpoints-with-the-normal-ones created!