Task: decrypting fields

[charlag]

AC

• There is a function inside API to convert between untyped map of encrypted values and typed map of decrypted values given the session key
• All aggregates are processed
• It correctly handles empty/default values

Tasks

• Create an InstanceCryptoFacade
• Create a function to call the CryptoFacade to decrypt fields and InstanceMapper to map them
• Deal with empty/default values

Depends on #6953