Support non-standard AES-GCM nonce and tag sizes when using the CNG and OpenSSL backends

[qmuntal]

We currently fall back to Go crypto if the AES-GCM nonce size is not 12 or when the tag size is not 16:

https://github.com/golang-fips/openssl/blob/eb155dada337b0de53873aa42e89724ad59aa768/cipher.go#L358-L363
https://github.com/microsoft/go-crypto-winnative/blob/b49854c00e37c07d57cec6983adbec6ae9a0aa73/cng/aes.go#L107-L112

Either CNG and OpenSSL support more nonce and tag sizes. We should avoid falling back whenever possible.