fix(precompiles): return data for revert

[cloudgray]

Description

Problem

• When the caller contract calls the precompile, the error message isn’t propagated back to it.
• Unlike the geth opcode opRevert, which returns the error message in its return data and ErrExecutionReverted as the error, the Cosmos/EVM precompile currently returns nil as return data and a custom error type as the error.
• We need to make precompile errors behave like opRevert: return the error message in the return data and use ErrExecutionReverted as the error.

Solution

1. Modify return values on precompile error
   • Always return ErrExecutionReverted as the error.
   • Encode the original error message with the Revert selector ("Error(string)") as the return data.
   • Use evm.Interpreter.SetReturnData() to set that encoded data into EVMInterpreter.returnData.
2. Modify return values in ApplyMessageWithConfig
   • If err is ErrExecutionReverted, set res.Ret to evm.Interpreter.ReturnData().
3. Update the test util function
   • Previously, on error the code logged the revert reason via emitted events (which never occur when an error is thrown).
   • Now, pull the EthereumTxResponse.Ret returned in step 2, decode it with abi.UnpackRevert, and print that as the reason.

Result

As-Is

In the original code, errors thrown by the precompile were not propagated to the caller contract.

To-Be

Now, errors returned by the precompile are returned in the caller contract’s return data, and the test utilities have been updated so that the test code can verify them.

Closes: #223

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[vladjdk]

nit: revert typo

[vladjdk]

This is great, thank you!