Incorrect deserialization from sliced arrays

[chmp]

See #248

• Map
  • fixed
  • add test for non-supported list layouts (see below)
• List
  • fixed
  • add test for unsupported list layouts (non-increasing offsets, with data for null values)
• Binary - no changes required
• Utf8 - no changes required
• Dictionary
• Union
  • no changes required for slicing
  • but the impl assumes no skipped values in the underlying arrays and should verify this
  • alternative design: track for each child array the current position and skip as necessary
  • Test with "malicious" examples e.g., build union array with skipped values, non-consecutive offsets, ...
• Update changelog