rename to formal credentials provider name

[JacksonTian]

You need to complete

• unit tests and/or feature tests
• documentation is changed or added

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.37%. Comparing base (e290d30) to head (3415f30).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #89   +/-   ##
=======================================
  Coverage   99.37%   99.37%           
=======================================
  Files          20       20           
  Lines        1282     1282           
=======================================
  Hits         1274     1274           
  Misses          4        4           
  Partials        4        4           

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[peze]

非兼容性变更，如果用户有断言返回类型会出现问题，需要谨慎发布