add wrapper for sort_values

[dougbrn]

Resolves #86

Adds a wrapper for sort_values. This one is a bit different than the usual wrapper as dask has more of it's own functionality because sorting is a much more dask-sensitive operation. This is kind of a crude solution, but we effectively just call dasks sort_values when not sorting on nested layers, but then call a map_partitioned version of nested-pandas sort_values when working on nested layers.

These really act as two different functions under the same namespace, as top-level sorting invokes the neccesary parallelization and consequences of a shuffle that you'd expect with dask, dropping divisions. But sorting on nested layers is a contained problem that avoids dask shuffles and preserves the divisions information. We could break these out, but I think it would be better to make the functionality "feel" like nested-pandas so that would instead motivate breaking the functions out at the nested-pandas level too. The main issue I have with keeping them as one is that the kwarg set is subtly switching from one API to the other, and so things like optional kwargs may be confusing if a user switches their sorting from base->nested or vice-versa.

^But realistically, it may be fine to keep these as a single modified function until we get feedback that it's confusing in real use cases?

[github-actions]

Before [413eb33]	After [d3c5477]	Ratio	Benchmark (Parameter)
828±3ms	834±4ms	1.01	benchmarks.NestedFrameQuery.time_run
278±1ms	280±2ms	1.01	benchmarks.NestedFrameReduce.time_run
137M	137M	1	benchmarks.NestedFrameAddNested.peakmem_run
139M	139M	1	benchmarks.NestedFrameQuery.peakmem_run
135M	136M	1	benchmarks.NestedFrameReduce.peakmem_run
271±0.5ms	267±1ms	0.99	benchmarks.NestedFrameAddNested.time_run

Click here to view all benchmarks.

[dougbrn]

Unit tests fail due to nested-pandas not having a release version of sort_values

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.76%. Comparing base (413eb33) to head (806977a).
Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #88      +/-   ##
==========================================
+ Coverage   95.45%   95.76%   +0.31%     
==========================================
  Files           9        9              
  Lines         242      260      +18     
==========================================
+ Hits          231      249      +18     
  Misses         11       11              

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[hombit]

Great work, thank you. I'm opening an issue for LSDB!