Cartouche library to generate Ethereum key pairs.
Generates a new keypair as an {eth_address, private_key}.
{eth_address, private_key}
@spec generate_keypair() :: {<<_::160>>, <<_::256>>}
iex> {address, priv_key} = Cartouche.Keys.generate_keypair() iex> {byte_size(address), byte_size(priv_key)} {20, 32}