fixes PerformanceWarning in detect_non_wear_time_syed2021

[Trybnetic]

This PR fixes a "DataFrame is highly fragmented" PerformanceWarning in detect_non_wear_time_syed2021 originating from repeatedly writing into the same DataFrame. This Warning is now prevented by first collecting all pd.Series objects and then creating one DataFrame by pd.concat(..., axis=1).

The change has been tested with real world data and still produces the same results.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 72.02%. Comparing base (79b8384) to head (50f9c23).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
paat/wear_time.py	0.00%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #34   +/-   ##
=======================================
  Coverage   72.02%   72.02%           
=======================================
  Files           8        8           
  Lines         579      579           
=======================================
  Hits          417      417           
  Misses        162      162           

Flag	Coverage Δ
unittests	72.02% <0.00%> (ø)

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