Speed up NestedExtensionArray.copy

[hombit]

We don't need to validate data when we make a shallow copy of the extension array. Also, this fixes a typo.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.49%. Comparing base (b8707a9) to head (a3ce966).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #164   +/-   ##
=======================================
  Coverage   99.49%   99.49%           
=======================================
  Files          14       14           
  Lines         984      984           
=======================================
  Hits          979      979           
  Misses          5        5           

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[github-actions]

Before [b8707a9]	After [db13823]	Ratio	Benchmark (Parameter)
266M	266M	1	benchmarks.AssignSingleDfToNestedSeries.peakmem_run
88.4M	88.1M	1	benchmarks.NestedFrameAddNested.peakmem_run
93.3M	93.1M	1	benchmarks.NestedFrameQuery.peakmem_run
91.9M	91.6M	1	benchmarks.NestedFrameReduce.peakmem_run
285M	285M	1	benchmarks.ReassignHalfOfNestedSeries.peakmem_run
9.27±0.1ms	9.15±0.2ms	0.99	benchmarks.NestedFrameAddNested.time_run
7.93±0.1ms	7.84±0.07ms	0.99	benchmarks.NestedFrameQuery.time_run
1.59±0.02ms	1.58±0.03ms	0.99	benchmarks.NestedFrameReduce.time_run
31.7±5ms	30.5±6ms	0.96	benchmarks.ReassignHalfOfNestedSeries.time_run
23.4±0.8ms	22.2±0.05ms	0.95	benchmarks.AssignSingleDfToNestedSeries.time_run

Click here to view all benchmarks.