Simplify the codebase by using the single line functions style or new…

[imaNNeo]

… switch statement

[codecov]

Codecov Report

Attention: Patch coverage is 96.72131% with 2 lines in your changes missing coverage. Please review.

Project coverage is 88.99%. Comparing base (15c66cf) to head (0f0fa68).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/src/chart/pie_chart/pie_chart_renderer.dart	0.00%	1 Missing ⚠️
lib/src/chart/radar_chart/radar_chart.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1759      +/-   ##
==========================================
- Coverage   89.17%   88.99%   -0.19%     
==========================================
  Files          44       44              
  Lines        3031     3007      -24     
==========================================
- Hits         2703     2676      -27     
- Misses        328      331       +3     

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