Add stellar key support

[ilija42]

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[github-actions]

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[github-actions]

✅ API Diff Results - github.com/smartcontractkit/chainlink-common/keystore

✅ Compatible Changes (3)

corekeys (1)

• Stellar — ➕ Added

corekeys/models.KeyRing (1)

• Stellar — ➕ Added

package github (1)

• com/smartcontractkit/chainlink-common/keystore/corekeys/stellarkey — ➕ Added

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[Copilot]

Pull request overview

This PR adds Stellar (Soroban) key support to the keystore module, integrating a new stellarkey implementation and wiring it into existing keyring serialization and OCR2 key bundle chain-type handling.

Changes:

• Added a new stellarkey core key type (ed25519 seed-backed) with StrKey (“G…”) account address derivation, signing, and encrypted JSON import/export.
• Extended core keyring models/serialization to persist and restore Stellar keys.
• Added corekeys.Stellar chain type and enabled Stellar in OCR2 key bundle creation/import; updated module dependencies to include Stellar SDK + transitive updates.

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
keystore/go.mod	Adds Stellar SDK dependency and updates several direct/indirect module versions.
keystore/go.sum	Records checksums for new/updated dependencies (including Stellar SDK and transitive upgrades).
keystore/corekeys/stellarkey/key.go	Implements Stellar key (ed25519) with StrKey “G…” account address ID and signing.
keystore/corekeys/stellarkey/key_test.go	Adds test vectors for StrKey address derivation and ed25519 signature verification.
keystore/corekeys/stellarkey/export.go	Adds encrypted JSON export/import for Stellar keys following existing key patterns.
keystore/corekeys/stellarkey/export_test.go	Adds export/import roundtrip test using shared core key test utility.
keystore/corekeys/ocr2key/key_bundle.go	Enables corekeys.Stellar to create/load OCR2 ed25519 key bundles.
keystore/corekeys/ocr2key/export.go	Adds Stellar handling when importing OCR2 key bundles from encrypted JSON.
keystore/corekeys/models/models.go	Adds Stellar to KeyRing and to encrypted keyring (raw) serialization/deserialization.
keystore/corekeys/chaintype.go	Introduces Stellar chain type, numeric mapping, and supported chain list update.

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