Move datasets tests to nested_pandas folder

[hombit]

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[github-actions]

Before [631787f]	After [7c43e63]	Ratio	Benchmark (Parameter)
6.36±0.1ms	6.59±0.08ms	1.04	benchmarks.NestedFrameQuery.time_run
62.5±2ms	65.0±2ms	1.04	benchmarks.ReassignHalfOfNestedSeries.time_run
8.89±0.2ms	9.05±0.3ms	1.02	benchmarks.NestedFrameAddNested.time_run
280M	285M	1.02	benchmarks.ReassignHalfOfNestedSeries.peakmem_run
86M	85.8M	1	benchmarks.NestedFrameAddNested.peakmem_run
90M	89.8M	1	benchmarks.NestedFrameQuery.peakmem_run
88.2M	88.2M	1	benchmarks.NestedFrameReduce.peakmem_run
5.37±0.02ms	5.37±0.06ms	1	benchmarks.NestedFrameReduce.time_run
263M	259M	0.99	benchmarks.AssignSingleDfToNestedSeries.peakmem_run
34.5±4ms	32.3±2ms	0.94	benchmarks.AssignSingleDfToNestedSeries.time_run

Click here to view all benchmarks.

[dougbrn]

good catch!