add codecov.yml and set threshold to 0.2%, prevent coverage getting w…

[Danielmelody]

…orse

[Danielmelody]

According to codecov/codecov-action#554 (comment)

[sylvestre]

why not!
what is it going to do?

[Danielmelody]

@sylvestre it will result ci failure if any PR decrease coverage more than 0.2%

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.17 ⚠️

Comparison is base (7e21d4b) 29.69% compared to head (62198b5) 29.53%.

❗ Current head 62198b5 differs from pull request most recent head f6919ba. Consider uploading reports for the commit f6919ba to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1661      +/-   ##
==========================================
- Coverage   29.69%   29.53%   -0.17%     
==========================================
  Files          49       49              
  Lines       17029    17030       +1     
  Branches     8198     8202       +4     
==========================================
- Hits         5057     5030      -27     
- Misses       6983     6997      +14     
- Partials     4989     5003      +14     

see 16 files with indirect coverage changes

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