fix!(aliby): dimensions in tiler consistent with image

WHY IS THIS CHANGE NEEDED?:
- tiler dimensions are ctzyx, but image dimensions are tczyx by default.
  this leads to incorrect storage of shapes

HOW DOES THE CHANGE SOLVE THE PROBLEM?:
- re-arrange the dimensions in the shape property to match image
- justifying this for the purpose of getting ImageDummy to play well
  with Tiler

WHAT SIDE EFFECTS DOES THIS CHANGE HAVE?:
- this exposes technical debt: there are places in which the order of
  dimensions are hard-coded and later assumed like this, and leads to
  indexing dimensions by index rather than by name.  in addition, the
  assumed order of dimensions is inconsistent throughout tiler.  this is
  a recipe for confusion.  worth a refactor soon.