[ISSUE #9994] Improve switchTimerEngine command with OptionGroup validation

[majialoong]

Which Issue(s) This PR Fixes

Fixes #9994

Brief Description

Improve switchTimerEngine command with OptionGroup validation.

How Did You Test This Change?

Unit test and local test.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.78%. Comparing base (7fc5452) to head (d3a7abd).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #9995      +/-   ##
=============================================
- Coverage      48.82%   48.78%   -0.05%     
+ Complexity     12779    12769      -10     
=============================================
  Files           1327     1327              
  Lines          96441    96441              
  Branches       12440    12440              
=============================================
- Hits           47088    47049      -39     
- Misses         43613    43630      +17     
- Partials        5740     5762      +22     

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[majialoong]

This PR addresses the discussion in 9787. @RongtongJin Please take a look when you have time, Thanks!