Add option on MaskSObject to be able to choose between record delete and update

Cf :

<img width="841" alt="image" src="https://user-images.githubusercontent.com/35368290/183836756-41f2de61-9517-4db1-bd7b-86587614055a.png">

https://cloudcompliance.app/docs/datamasker/configure-datamasker/specify-object-field-masking/