feat: recover from declaration of existing class hash

[tserg]

Which component is your feature related to?

Cast

Feature Request

Currently, trying to declare(..) an already declared contract where the declare transaction is not in the state file causes sncast to throw. It would be nice if sncast could recover from this error on its own and declare the contract instead, then adding it to the state file.

[cptartur]

Resolved in #2469