Added multi-chan keyring; added injective keys

[a-ok123]

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[roomote]

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All previously identified issues have been resolved. No new issues found.

• Hash function mismatch in ethsecp256k1: Sign uses SHA256 but VerifySignature uses Keccak256
• Inverted ADR-36 verification logic in ica-request-verify/main.go

Previous reviews

• 52a6f4e: Review #1
• 047fc10: Review #2

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}

[Copilot]

Pull request overview

This PR introduces a multi-chain-aware keyring that can handle both standard Cosmos secp256k1 and Injective-style ethsecp256k1 keys, and adds an ICA example that verifies app-level signatures (including ADR-36) along with the necessary crypto implementation and dependencies.

Changes:

• Added NewMultiChainKeyring to create a Cosmos keyring with a codec that knows both standard secp256k1 and Injective ethsecp256k1 key types, with basic ~ expansion for the keyring directory.
• Implemented an ethsecp256k1 key type (PrivKey/PubKey) wired to Injective’s proto type URLs, using go-ethereum crypto for signing, verification, and address derivation, plus associated go-ethereum dependencies.
• Extended ICA examples: ica-request-tx now uses the multi-chain keyring and supports a --keyring-type flag, and a new ica-request-verify example builds the same ICS-27 payload while additionally verifying app-level and ADR-36 signatures; the Makefile is updated to build the new example.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
pkg/crypto/multichain_keyring.go	Introduces NewMultiChainKeyring, constructing a proto codec that registers both Cosmos secp256k1 and Injective ethsecp256k1 key implementations and wiring it into a Cosmos keyring instance with basic ~/ path expansion.
pkg/crypto/ethsecp256k1/ethsecp256k1.go	Adds an ethsecp256k1 PrivKey/PubKey implementation using go-ethereum’s crypto package, including proto integration and an interface registration helper, but with issues in the Equals/Sign/Verify methods and lacking tests.
go.mod	Adds github.com/ethereum/go-ethereum (direct) and github.com/holiman/uint256 (indirect) to support the new ethsecp256k1 implementation.
examples/ica-request-verify/main.go	New example that mirrors ica-request-tx but additionally decodes Cascade metadata, parses and coerces signatures, and verifies both direct and ADR-36-style app signatures, with a small logic bug in the ADR-36 verification branch.
examples/ica-request-tx/main.go	Switches from NewKeyring to NewMultiChainKeyring and adds a --keyring-type flag to choose app name (lumera vs injectived) for multi-chain keyring usage.
Makefile	Extends the EXAMPLES list to include the new ica-request-verify example so it’s built by make examples.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 7 changed files in this pull request and generated 5 comments.