Add new authenticator configs for user defined auth extensions.

[Thisara-Welmilla]

Issue:

• Provide API for the new custom authentication management product-is#21216

With this PR, we added getters to retrieve the endpoint configurations of user defined authenticators.

Related PR:

• Add new authenticator configs for user defined authentication extensions. #6108

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.72%. Comparing base (0c77d92) to head (3cbde60).
Report is 22 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6114      +/-   ##
============================================
- Coverage     40.76%   40.72%   -0.05%     
+ Complexity    14485    14468      -17     
============================================
  Files          1768     1766       -2     
  Lines        117713   117701      -12     
  Branches      20305    20301       -4     
============================================
- Hits          47984    47931      -53     
- Misses        62451    62491      +40     
- Partials       7278     7279       +1     

Flag	Coverage Δ
unit	25.04% <100.00%> (+0.01%)	⬆️

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud