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>

eth/tracers/tracer.go

@@ -162,7 +162,7 @@ func (sw *stackWrapper) peek(idx int) *big.Int {
 		log.Warn("Tracer accessed out of bound stack", "size", len(sw.stack.Data()), "index", idx)
 		return new(big.Int)
 	}
-	return sw.stack.Data()[len(sw.stack.Data())-idx-1]
+	return sw.stack.Back(idx).ToBig()
 }
 
 // pushObject assembles a JSVM object wrapping a swappable stack and pushes it