Adding ECC KEM

[NIIBE Yutaka]

Hello,

In the task T6755, we introduced KEM API.  ML-KEM is added.

Today, I'd like to propose adding ECC KEM implementation in the API.
The intention of mine is use in gpg-agent to support PQC (task T7014).

Attached is a patch adding ECC KEM for X25519.
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