add: snsUserInfo struct 定义

[Choicelin]

在调用这个api时，无法获取unionid, 于是我加了这个定义，望能合并

[codecov]

Codecov Report

Merging #84 (7e43e2b) into main (214f82e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #84   +/-   ##
=======================================
  Coverage   97.52%   97.52%           
=======================================
  Files          89       89           
  Lines        1093     1093           
=======================================
  Hits         1066     1066           
  Misses         17       17           
  Partials       10       10           

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