feat: add bridge call refund callback

[zakir-code]

Summary by CodeRabbit

• New Features

  • Introduced Ethereum contract binding for refund callbacks.
  • Added a new interface IRefundCallback for handling refund callbacks in Solidity.
  • New event type EventTypeBridgeCallRefundOut for bridge call refunds.

• Improvements

  • Enhanced session management for Ethereum contract interactions.
  • Improved import structure in Solidity contracts for better modularity.

• Bug Fixes

  • Corrected event type in bridge call handling from EventTypeBridgeCallRefund to EventTypeBridgeCallRefundOut.

• Refactor

  • Cleaned up Solidity configuration by removing one-contract-per-file rule.
  • Refactored import statements for better code organization.

[coderabbitai]

Walkthrough

The recent updates introduce a new Ethereum contract binding for refund callbacks, modify import statements for better modularity, and enhance the bridge call refund handling in the crosschain module. Key changes include the addition of new structs and functions for contract interactions, updates to event types, and improvements to the Keeper struct in the crosschain module for Ethereum contract interactions.

Changes

File(s)	Change Summary
contract/IRefundCallback.go, contract/compile.sh, contract/contract.go	Added new Ethereum contract binding for refund callbacks, updated compile script, and introduced ABI-related functions.
solidity/contracts/bridge/FxBridgeLogic.sol, solidity/contracts/bridge/FxBridgeLogicETH.sol, solidity/contracts/bridge/IBridgeCallback.sol, solidity/contracts/bridge/IRefundCallback.sol	Modified import statements for better modularity and introduced a new interface for refund callbacks.
solidity/.solhint.json	Removed one-contract-per-file configuration.
x/crosschain/keeper/bridge_call_in.go, x/crosschain/keeper/bridge_call_in_test.go	Updated event type from EventTypeBridgeCallRefund to EventTypeBridgeCallRefundOut.
x/crosschain/keeper/bridge_call_refund.go, x/crosschain/keeper/keeper.go	Enhanced bridge call refund handling and added Ethereum-related fields and imports in the Keeper struct.
x/crosschain/mock/expected_keepers_mocks.go	Added GetAccount mock methods to MockEVMKeeper.
x/crosschain/types/events.go	Introduced a new constant EventTypeBridgeCallRefundOut.
x/crosschain/types/expected_keepers.go	Added GetAccount method to EVMKeeper interface.
x/crosschain/types/types.go	Added ERC20Tokens type and methods for extracting contract addresses and amounts.
x/evm/precompiles/crosschain/bridge_call.go	Modified return statement in BridgeCall function to return eventNonce.

🐇
In the world of code, where bytes do dance,
New contracts bloom, enhancing our stance.
Refunds now flow with structured grace,
Events renamed, keeping pace.
Ethereum whispers in Keeper's ear,
A bridge of logic, crystal clear.
🐰

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[zakir-code]

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