feat: adds the missing AddGroupingPoliciesEx and AddNamedGroupingPoliciesEx APIs to sync jCasbin with Go Casbin

[Copilot]

This PR adds the missing AddGroupingPoliciesEx and AddNamedGroupingPoliciesEx APIs to sync jCasbin with Go Casbin implementation (commit ea5ed6b).

Changes

New APIs in ManagementEnforcer

• addGroupingPoliciesEx(List<List<String>> rules) - Adds grouping policies with default "g" ptype
• addGroupingPoliciesEx(String[][] rules) - Overload accepting String array
• addNamedGroupingPoliciesEx(String ptype, List<List<String>> rules) - Named version with custom ptype
• addNamedGroupingPoliciesEx(String ptype, String[][] rules) - Named overload accepting String array

Thread-safe implementations in SyncedEnforcer

All four methods are properly overridden with synchronization support using runSynchronized().

Motivation

The "Ex" variants provide more flexible policy management compared to the regular APIs:

Regular APIs (addGroupingPolicies):

• Fail completely if ANY rule in the batch already exists
• All-or-nothing approach

Ex APIs (addGroupingPoliciesEx):

• Continue adding non-existent rules even if some already exist
• Partial success approach - useful for bulk operations where some rules may already be in place

Example Usage

Enforcer e = new Enforcer("examples/rbac_model.conf", "examples/rbac_policy.csv");

String[][] groupingRules = {
    {"alice", "data2_admin"}, // Already exists
    {"bob", "data1_admin"},   // New
    {"eve", "data3_admin"}    // New
};

// This succeeds and adds bob and eve, skipping alice's existing rule
boolean result = e.addGroupingPoliciesEx(groupingRules);
// result = true (at least one rule was added)

Testing

• Added comprehensive test coverage in ManagementAPIUnitTest
• Added thread-safety tests in SyncedManagementAPIUnitTest
• All 193 tests pass, including 2 new tests
• No breaking changes to existing functionality

Fixes #459 (required by apache/casbin-jcasbin-postgres-watcher#3)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[feature] sync new APIs like AddNamedGroupingPoliciesEx() from Go Casbin to jCasbin</issue_title>
<issue_description>Required by: apache/casbin-jcasbin-postgres-watcher#3

About what APIs to add, refer to Golang Casbin: apache/casbin@ea5ed6b

Need to add the missing APIs, need to sync missing APIs from Golang Casbin</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #461

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.30%. Comparing base (747eb33) to head (065284f).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #463      +/-   ##
==========================================
+ Coverage   66.77%   67.30%   +0.52%     
==========================================
  Files          60       60              
  Lines        2992     3000       +8     
  Branches      557      557              
==========================================
+ Hits         1998     2019      +21     
+ Misses        811      802       -9     
+ Partials      183      179       -4     

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[github-actions]

🎉 This PR is included in version 1.85.0 🎉

The release is available on:

• GitHub release
• v1.85.0

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