Support simpleomp on Windows with MSVC

[Jiang-Weibo]

1. Modify the CMakeLists.txt on the top level to leverage openmp on MSVC
2. Support simpleomp on MSVC
3. Test the results using the existed tests folder

[tencent-adm]

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1 out of 2 committers have signed the CLA.

✅ Jiang-Weibo
❌ s2496214

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.04%. Comparing base (204583b) to head (f7c48d5).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5683       +/-   ##
===========================================
- Coverage   94.76%   92.04%    -2.72%     
===========================================
  Files         790      333      -457     
  Lines      249195   105064   -144131     
===========================================
- Hits       236138    96702   -139436     
+ Misses      13057     8362     -4695     

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