Add missing file. (#94)

src/utils_.toit

@@ -0,0 +1,15 @@
+// Copyright (C) 2024 Toitware ApS. All rights reserved.
+// Use of this source code is governed by an MIT-style license that can be
+// found in the LICENSE file.
+
+import io
+
+io-data-to-byte-array_ data/io.Data from/int=0 to/int=data.byte-size -> ByteArray:
+  if data is ByteArray:
+    byte-array := data as ByteArray
+    if from == 0 and to == byte-array.size: return byte-array
+    return byte-array[from..to]
+
+  byte-array := ByteArray (to - from)
+  data.write-to-byte-array byte-array --at=0 from to
+  return byte-array