feat: store signin url when getting the signup url

[seriouszyx]

For: https://github.com/casdoor/casdoor/issues/856#issuecomment-1177018733

Signed-off-by: Yixiang Zhao seriouszyx@foxmail.com

[casbin-bot]

@Steve0x2a @Abingcbc @ComradeProgrammer please review

[codecov[bot]]

Codecov Report

Merging #30 (ed2f3fd) into master (72d5587) will decrease coverage by 0.60%. The diff coverage is 0.00%.

:exclamation: Current head ed2f3fd differs from pull request most recent head 82693eb. Consider uploading reports for the commit 82693eb to get more accurate results

@@            Coverage Diff             @@
##           master      #30      +/-   ##
==========================================
- Coverage   19.35%   18.75%   -0.61%     
==========================================
  Files           2        2              
  Lines          31       32       +1     
  Branches        6        5       -1     
==========================================
  Hits            6        6              
- Misses         25       26       +1     

Impacted Files	Coverage Δ
src/sdk.ts	13.33% <0.00%> (-0.46%)	:arrow_down:

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[github-actions[bot]]

:tada: This PR is included in version 0.3.0 :tada:

The release is available on:

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

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