feat: ERC20 multi-minter governance tests

[kpitapeersyst]

feat: ERC20 multi-minter governance tests

Changes 🛠️

modules/cosmos

• Extracted Ethermint-specific code (account parser, pubkey, secp256k1, signer, signing stargate client) from ibc/ into a new ethermint/ module.
• Added EthermintSigningClient base class that registers Ethermint pubkey/account types and unwraps EthAccount on account queries.
• Refactored IBCEvmSignerClient to extend EthermintSigningClient, removing duplicated registry/parser logic.
• Added gov/ module with submitAndVote helper that submits a single-message proposal, votes YES, and polls for a terminal status.
• Added query/ module with queryAbci helper for raw ABCI queries.
• Exposed ./gov, ./ethermint, and ./query as package entry points.

modules/evm

• Added ERC20 Multi-Minter governance test suite covering add/remove minter flows, multi-minter mint/burn authorization, and unregistered-denom error paths.
• Added test utilities: utils/cosmos.ts (bech32/hex conversion, token-pair owner assertions), utils/minters.ts (add/remove minter via gov proposals), utils/proto.ts (message encoders).
• Extended utils/helpers.ts with expectMinterCanMintAndBurn and resetOwnerState.
• Removed single-owner (transferOwnership, owner) tests from the ERC20 precompile suite and dropped the related ABI entries from localnet.module.config.json.
• Fixed allowance argument order in the ERC20 approve test.
• Added cosmos section to localnet.module.config.json (RPC URL, mnemonic, denom, prefix, gov module address) and corrected chainId to 1449999.
• Added @firewatch/cosmos, @cosmjs/encoding, and cosmjs-types dependencies; set rootDir and disabled declaration emit in tsconfig.json.