feat: support popupSignin

[imp2002]

For: https://github.com/casdoor/casdoor/pull/1668

[casbin-bot]

@seriouszyx @ComradeProgrammer @Resulte please review

[codecov[bot]]

Codecov Report

Merging #41 (5e20396) into master (7b28442) will decrease coverage by 1.70%. The diff coverage is 0.00%.

@@            Coverage Diff            @@
##           master     #41      +/-   ##
=========================================
- Coverage    8.21%   6.52%   -1.70%     
=========================================
  Files           2       2              
  Lines          73      92      +19     
  Branches       17      19       +2     
=========================================
  Hits            6       6              
- Misses         67      86      +19     

Impacted Files	Coverage Δ
src/sdk.ts	4.44% <0.00%> (-1.19%)	:arrow_down:

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[github-actions[bot]]

:tada: This PR is included in version 0.9.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: