Use std::unordered_map instead of std::map

[tigercosmos]

part of #977

changed std::map to std::unordered_map

there are a few cases that still keep using std::map due to the original intention usage of the std::map properties.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4893499) 82.42% compared to head (58234a0) 82.42%.
Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1285   +/-   ##
=======================================
  Coverage   82.42%   82.42%           
=======================================
  Files         161      161           
  Lines       20764    20764           
  Branches     7846     7854    +8     
=======================================
  Hits        17115    17115           
+ Misses       2993     2987    -6     
- Partials      656      662    +6     

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unittest	82.42% <100.00%> (ø)
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[tigercosmos]

@seladb ready for review. the only failed case is the CI issue.

[tigercosmos]

@seladb still happens, any idea?

[seladb]

@tigercosmos maybe you need to change the CirrusCI image to freebsd-version: "13.2"?
This is done in this PR: #1281

[tigercosmos]

@seladb should be fine now.

[seladb]

Thank you @tigercosmos for working on this! I think we finally got rid of std::map 😄