feat: update WatcherEx interface

[PokIsemaine]

feat: update WatcherEx interface
a part of #340

[casbin-bot]

@tangyang9464 @imp2002 please review

[codecov-commenter]

Codecov Report

Merging #342 (cd02491) into master (b8df7d8) will decrease coverage by 0.05%.
The diff coverage is 42.42%.

@@            Coverage Diff             @@
##           master     #342      +/-   ##
==========================================
- Coverage   69.33%   69.28%   -0.05%     
==========================================
  Files          48       49       +1     
  Lines        2214     2230      +16     
  Branches      409      405       -4     
==========================================
+ Hits         1535     1545      +10     
- Misses        561      570       +9     
+ Partials      118      115       -3     

Impacted Files	Coverage Δ
...java/org/casbin/jcasbin/main/InternalEnforcer.java	49.07% <17.39%> (-1.88%)	⬇️
...ain/java/org/casbin/jcasbin/persist/WatcherEx.java	100.00% <100.00%> (ø)

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[PokIsemaine]

need some suggestions about codeclimate.
I tried refactoring three versions and none of them passed codeclimate

The problem goes back and forth between similar blocks of code and the function being too complex. Because I tried to reduce similar code blocks and extracted a notifyWatcher function, but it seems easy to complicate (for codeclimate)

[github-actions]

🎉 This PR is included in version 1.33.0 🎉

The release is available on:

• GitHub release
• v1.33.0

Your semantic-release bot 📦🚀