feat: support batchAdapter

[imp2002]

Similar with: jcasbin/redis-adapter#16

[casbin-bot]

@tangyang9464 please review

[codecov]

Codecov Report

Base: 68.42% // Head: 69.89% // Increases project coverage by +1.47% 🎉

Coverage data is based on head (9849f07) compared to base (472fa35).
Patch coverage: 86.66% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #10      +/-   ##
============================================
+ Coverage     68.42%   69.89%   +1.47%     
- Complexity       34       38       +4     
============================================
  Files             2        2              
  Lines           171      186      +15     
  Branches         22       22              
============================================
+ Hits            117      130      +13     
- Misses           37       38       +1     
- Partials         17       18       +1     

Impacted Files	Coverage Δ
...c/main/java/org/casbin/adapter/MybatisAdapter.java	73.85% <86.66%> (+1.39%)	⬆️

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