[Feat] add secret chain

[Marca23]

No description provided.

[Copilot]

Pull request overview

Adds support for Secret Network (“Secret” chain type) including address derivation and an FKMS gRPC endpoint to produce signed Secret/Cosmos SDK transactions containing encrypted CosmWasm execute messages.

Changes:

• Extend signer abstractions and local signer to support ChainType::Secret, including Secret bech32 address derivation.
• Add Secret-specific codec utilities for encrypting execute messages and building/signing Cosmos SDK tx bytes.
• Add SignSecret gRPC method + protobuf messages and wire it into the server.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
src/config/signer/local.rs	Adds Secret to supported local chain types.
src/signer.rs	Adds Secret address derivation and exposes optional private_key() on the Signer trait.
src/signer/local.rs	Implements Secret key handling/address derivation; stores and returns private key bytes.
src/codec/cosmwasm_secret.rs	New module to encrypt Secret execute messages and sign Cosmos SDK transactions.
src/codec.rs	Exposes the new cosmwasm_secret codec module.
src/server/service.rs	Adds sign_secret RPC implementation and chain type mapping.
proto/fkms/v1/signer.proto	Adds SignSecret RPC, payload/response types, and SECRET enum value.
Cargo.toml / Cargo.lock	Adds dependencies required for Cosmos/Secret tx signing + encryption.

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[Copilot]

Pull request overview

Copilot reviewed 9 out of 10 changed files in this pull request and generated 5 comments.

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