feat: mpool: Include gaslimit in error msg in ValidForBlockInclusion

chain/types/message.go

@@ -196,7 +196,7 @@ func (m *Message) ValidForBlockInclusion(minGas int64, version network.Version)
 	}
 
 	if m.GasLimit > build.BlockGasLimit {
-		return xerrors.New("'GasLimit' field cannot be greater than a block's gas limit")
+		return xerrors.Errorf("'GasLimit' field cannot be greater than a block's gas limit (%d > %d)", m.GasLimit, build.BlockGasLimit)
 	}
 
 	// since prices might vary with time, this is technically semantic validation