The Driver interface signature should document the possible exceptions

[FabioPinheiro]

We should have documentation on the method that can through a exception.
On the read/update/delete methods

https://github.com/hyperledger-identus/vdr/blob/main/src/main/kotlin/org/hyperledger/identus/vdr/interfaces/Driver.kt

See hyperledger-identus/prism-vdr-driver#41