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This commit introduces support for using ECDSA P-384 as an encryption
algorithm for generating certificates and keys within kubeadm.
The following changes are included:
- Defined the `EncryptionAlgorithmECDSAP384` constant in the kubeadm API types.
- Updated API documentation to reflect the new algorithm option ("ECDSA-P384").
- Added validation for `ECDSA-P384` in the cluster configuration.
- Implemented key generation logic for ECDSA P-384 keys in `pkiutil`
(using `elliptic.P384()`).
- Added corresponding unit tests to verify the new algorithm's functionality
in `pkiutil`.
This allows users to choose ECDSA P-384 for
kubeadm-managed clusters.