Implement X25519, X448, Ed25519 & Ed448 support

[ic0ns]

Summary

• Implemented support for X25519, X448, Ed25519, and Ed448 cryptographic algorithms
• Added complete implementation including models, handlers, preparators, and parsers
• Added comprehensive test coverage for all new functionality

Changes

• Added public key models for all four Edwards curves
• Implemented handlers to manage context updates during parsing and preparation
• Created preparators to encode public keys (32 bytes for Ed25519/X25519, 56-57 bytes for Ed448/X448)
• Added parsers to read Edwards curve public keys from ASN.1 octet strings
• Extended X509CertificateConfig with fields and methods for Edwards curve keys
• Extended X509Context with fields and methods for Edwards curve keys
• Extended X509Chooser with methods to retrieve Edwards curve keys
• Added comprehensive unit tests for all preparators

Test plan

• All unit tests pass
• Code compiles without errors
• Code formatted with spotless
• Tested key encoding for correct byte lengths (32 bytes for Ed25519/X25519, 56-57 bytes for Ed448/X448)