Smart Contracts: add `Crypto.encrypt_with_storage_nonce/1` and `Crypto.encrypt/2`

[bchamagne]

Is your feature request related to a problem?

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Describe the solution you'd like

Crypto.encrypt_with_storage_nonce/1 can encrypt any hexadecimal with the storage nonce public key (making it only decryptable by the nodes) (to be used with Crypto.decrypt_with_storage_nonce/1) Crypto.encrypt/2 can encrypt any hexadecimal with the given public key

Additional context

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Epic

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