feat: Implement slip-0010 and seed-curve arg

[adamspofford-dfinity]

No description provided.

[Copilot]

Pull request overview

Adds SLIP-0010-based key derivation from BIP-39 seed phrases and exposes a --seed-curve CLI option so seed imports can generate non-secp256k1 identities.

Changes:

• Implement SLIP-0010 derivation for secp256k1, P-256, and ed25519 and expose a new derive_key_from_seed_slip10 helper.
• Extend icp identity import with --seed-curve and add CLI integration tests for p256/ed25519 seed imports.
• Add hmac dependency wiring and update docs/changelog accordingly.

Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
docs/reference/cli.md	Documents the new --seed-curve option for identity import.
crates/icp/src/identity/seed/slip10.rs	New SLIP-0010 derivation implementation for secp256k1/p256/ed25519.
crates/icp/src/identity/seed/mod.rs	New seed module API: standard derivation paths + derive_key_from_seed_slip10.
crates/icp/src/identity/seed.rs	Removes the previous BIP32-based default seed derivation helper.
crates/icp/Cargo.toml	Adds hmac dependency to support SLIP-0010 derivation.
crates/icp-cli/tests/identity_tests.rs	Adds coverage for --seed-curve with p256 and ed25519 principals.
crates/icp-cli/src/commands/identity/new.rs	Switches identity creation-from-seed to the new SLIP-0010 helper.
crates/icp-cli/src/commands/identity/import.rs	Adds --seed-curve flag and routes seed imports through SLIP-0010 derivation.
Cargo.toml	Adds workspace dependency version for hmac.
Cargo.lock	Locks hmac as a dependency.
CHANGELOG.md	Notes the new --seed-curve import feature.

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