RFR: 8189441: Define algorithm names for keys derived from KeyAgreement [v7]

[Weijun Wang]

On Fri, 3 Jan 2025 22:11:18 GMT, Weijun Wang <weijun at openjdk.org> wrote:

>> Allow `Generic` as an algorithm in the `KeyAgreement::generateSecret(alg)` method.
>
> Weijun Wang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add KDF and KDFSpi

I've reverted all changes not related to `KeyAgreement` and put them in https://github.com/openjdk/jdk/pull/22929, including the `KEM` one, since it involves no behavior change and is pure clarification. I've also removed the "KEM" word from the bug title.

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PR Comment: https://git.openjdk.org/jdk/pull/22650#issuecomment-2573443190