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 95.16%. Comparing base (204583b) to head (f7c48d5).
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5683      +/-   ##
==========================================
+ Coverage   94.76%   95.16%   +0.40%     
==========================================
  Files         790      793       +3     
  Lines      249195   271152   +21957     
==========================================
+ Hits       236138   258042   +21904     
- Misses      13057    13110      +53     

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