core/vm: use uint256 in EVM implementation (#20787)

* core/vm: use fixed uint256 library instead of big

* core/vm: remove intpools

* core/vm: upgrade uint256, fixes uint256.NewFromBig

* core/vm: use uint256.Int by value in Stack

* core/vm: upgrade uint256 to v1.0.0

* core/vm: don't preallocate space for 1024 stack items (only 16)

Co-authored-by: Martin Holst Swende <martin@swende.se>

core/vm/logger_json.go

@@ -62,7 +62,12 @@ func (l *JSONLogger) CaptureState(env *EVM, pc uint64, op OpCode, gas, cost uint
 		log.Memory = memory.Data()
 	}
 	if !l.cfg.DisableStack {
-		log.Stack = stack.Data()
+		//TODO(@holiman) improve this
+		logstack := make([]*big.Int, len(stack.Data()))
+		for i, item := range stack.Data() {
+			logstack[i] = item.ToBig()
+		}
+		log.Stack = logstack
 		log.ReturnStack = rStack.data
 	}
 	return l.encoder.Encode(log)