feat: support AutoSave in built-in FileAdapter

[imp2002]

No description provided.

[casbin-bot]

@tangyang9464 please review

[imp2002]

Because the previous unit tests defaulted to a File Adapter that didn't implement addPolicy() and removePolicy(), ignoring the impact of autoSave, implementing addPolicy() and removePolicy() now results in inconsistent expect. Therefore, it is necessary to modify the previous tests.

For example:

Following the implementation of File Adapter's addPolicy() method, the policy will change when autoSave is enabled.

[hsluoyz]

@imp2002 you can keep that existing test in AutoSave OFF mode. Then add a new test case which enables AutoSave

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 52.38095% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 69.04%. Comparing base (c56af29) to head (1afb96a).

Files	Patch %	Lines
...sbin/jcasbin/persist/file_adapter/FileAdapter.java	52.38%	7 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #391      +/-   ##
==========================================
- Coverage   69.38%   69.04%   -0.34%     
==========================================
  Files          53       53              
  Lines        2401     2420      +19     
  Branches      423      426       +3     
==========================================
+ Hits         1666     1671       +5     
- Misses        621      634      +13     
- Partials      114      115       +1     

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[github-actions]

🎉 This PR is included in version 1.54.0 🎉

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• v1.54.0

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