Benchmarks for nested element assignment

[hombit]

Adds two pairs of benchmarks: time and peak memory usage for single element assignment and massive (len(series)//2) assignment to a nested series.

This PR partially implements #37, and gives some information for #53.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.50%. Comparing base (49b03ff) to head (7e3cd15).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #54   +/-   ##
=======================================
  Coverage   97.50%   97.50%           
=======================================
  Files          14       14           
  Lines         801      801           
=======================================
  Hits          781      781           
  Misses         20       20           

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[github-actions]

Before [49b03ff]	After [e2875db]	Ratio	Benchmark (Parameter)
31.9±3ms	39.4±7ms	~1.23	benchmarks.AssignSingleDfToNestedSeries.time_run
53.4±2ms	56.8±2ms	1.06	benchmarks.ReassignHalfOfNestedSeries.time_run
258M	257M	1.00	benchmarks.AssignSingleDfToNestedSeries.peakmem_run
275M	271M	0.98	benchmarks.ReassignHalfOfNestedSeries.peakmem_run

Click here to view all benchmarks.

[wilsonbb]

Awesome, thanks!