feat: support enforceEx

[imp2002]

Fix: #297

[casbin-bot]

@tangyang9464 please review

[codecov-commenter]

Codecov Report

Merging #300 (bb9bf89) into master (9fd266f) will increase coverage by 0.06%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master     #300      +/-   ##
==========================================
+ Coverage   69.48%   69.55%   +0.06%     
==========================================
  Files          47       47              
  Lines        2173     2181       +8     
  Branches      404      405       +1     
==========================================
+ Hits         1510     1517       +7     
- Misses        549      550       +1     
  Partials      114      114              

Impacted Files	Coverage Δ
src/main/java/org/casbin/jcasbin/util/Util.java	58.33% <60.00%> (+0.09%)	⬆️
...ain/java/org/casbin/jcasbin/main/CoreEnforcer.java	78.49% <100.00%> (+0.43%)	⬆️
...n/java/org/casbin/jcasbin/main/SyncedEnforcer.java	67.42% <100.00%> (+0.50%)	⬆️

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[github-actions]

🎉 This PR is included in version 1.30.0 🎉

The release is available on:

• GitHub release
• v1.30.0

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