Add proposal for crypto building block (#3)

* Add proposal for crypto building block

Ported from dapr/dapr#4508

Signed-off-by: ItalyPaleAle <[email protected]>

* Add binding between document and decryption key

Signed-off-by: ItalyPaleAle <[email protected]>

* Naming is hard

Signed-off-by: ItalyPaleAle <[email protected]>

* Clarify size of AES-KW keys

Signed-off-by: ItalyPaleAle <[email protected]>

* Updated algs for key wrapping. Add AES-CBC

Signed-off-by: ItalyPaleAle <[email protected]>

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Signed-off-by: ItalyPaleAle <[email protected]>

Author: ItalyPaleAle