Function encrypt_stream_frames_with_rng 

pub fn encrypt_stream_frames_with_rng<R>(
    plaintext: &[u8],
    stream_id: Uuid,
    sender_public_key: PublicKey<33>,
    recipient_public_key: PublicKey<33>,
    max_plaintext_frame_len: usize,
    rng: R,
) -> Result<E2eStreamFrames<'_, R>, Error>
where
    R: RngCore,

Encrypt a byte slice lazily into direct-ElGamal E2E stream frames.