Add reference implementation

pkg/helpers/slices/slices.go

@@ -7,6 +7,7 @@ import (
 // BytesToString converts bytes to a string without memory allocation.
 // NOTE: The given bytes MUST NOT be modified since they share the same backing array
 // with the returned string.
+// Reference implementation: https://github.com/golang/go/blob/ad7c32dc3b6d5edc3dd72b3e15c80dc4f4c27064/src/strings/builder.go#L47.
 func BytesToString(bs []byte) string {
 	return *(*string)(unsafe.Pointer(&bs))
 }