crypto: Use aead functions for CHACHA20_POLY1305

This previously implemented cipher is a block cipher despite using chacha.

It also uses the EVP_CIPHER_CTX api which now unifies AES_GCM and AES_CCM
into one pair of encrypt and decrypt functions.

By integrating the existing chacha20_poly1305 code into aead_encrypt and
aead_decrypt we could remove two C-functions and simplify both the C-code
and the corresponding Erlang code in the CRYPTO application.

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