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Adjust `extrema`'s internal structured type handling (#77)

* Covert `extrema`'s component types to `dtype`s

Make sure that each component type in `extrema`'s structured `dtype` is
converted to a `dtype`.

* Use a 1-D singleton array in `extrema`'s kernel

Instead of using a 0-D array in `extrema`'s kernel function,
use a 1-D singleton array. As we have generally had better luck working
with 1-D singleton structured arrays with Dask, it makes sense to use
these consistently internally as well. Also avoids some hacky tricks to
extract the value from the array in favor of just selecting the value.

* Make `extrema`'s default with 1-D singleton array

Instead of using a 0-D array to construct `extrema`'s default value, use
a 1-D singleton array. As we have generally had better luck working with
1-D singleton structured arrays with Dask, it makes sense to use these
consistently internally as well. Also avoids some hacky tricks to
extract the value from the array in favor of just selecting the value.

* Reorder `extrema`'s internal structured `dtype`

Adjust the order of the `extrema`'s internal structured `dtype` to match
the order of the result returned.

* Make a mapping of `extrema`'s structured `dtype`

Define a mapping using an `OrderedDict` of the names and types within
the structured `dtype`. Use this to build the structured `dtype`. Also
use this to breakout the specific results after running `extrema`'s
kernel with `labeled_comprehension`.

* Bind `dtype` in `extrema` kernel function

Instead of reconstructing the `dtype` in `extrema`'s kernel function,
bind this in advance using `functools.partial` so that it can be passed
through to the `extrema` kernel function unchanged. Thus avoiding the
need to define this in two different places and potentially getting them
messed up.

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