kem::encap_with_eph parameters disambiguition

[BoOTheFurious]

Hello,

What is the purpose of the sk_eph: Self::PrivateKey parameter in the kem::encap_with_eph function.
The name suggest it is the ephemeral secret but it's the role of this function to generate it and it is not coherent with the type.
This parameters seems to be useless. Is there something I did not understand ?

Regards

[rozbb]

encap_with_eph doesn't generate its own ephemeral secret, in fact, it doesn't even take an RNG as input. Generating sk_eph is the job of encap. I split out the functionality because 1) it's slightly easier this way and 2) I need encap_with_eph for running test vectors.

[rozbb]

Fixed in #27