Add new authenticator configs for user defined authentication extensions.

[Thisara-Welmilla]

Issue:

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

With this PR, following changes will be added.

• Introduce new models for endpoint configurations of the user defined authenticators.
• Introduced new authenticator configuration UserDefinedFederatedAuthenticator model to for user defined fed authenticators extending FederatedAuthenticatorConfig class.
• Introduced new authenticator configuration UserDefinedLocalAuthenticator model to for user defined fed authenticators extending LocalAuthenticatorConfig class.
• Improve action auithentication class model.
• Cover unit tests for new models.

[codecov]

Codecov Report

Attention: Patch coverage is 78.87324% with 15 lines in your changes missing coverage. Please review.

Project coverage is 40.76%. Comparing base (c0ba5cc) to head (0c77d92).
Report is 19 commits behind head on master.

Files with missing lines	Patch %	Lines
...entity/action/management/model/Authentication.java	62.50%	6 Missing and 3 partials ⚠️
...model/UserDefinedFederatedAuthenticatorConfig.java	57.14%	3 Missing ⚠️
...mon/model/UserDefinedLocalAuthenticatorConfig.java	66.66%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6108      +/-   ##
============================================
- Coverage     40.98%   40.76%   -0.22%     
+ Complexity    14698    14485     -213     
============================================
  Files          1764     1768       +4     
  Lines        119164   117713    -1451     
  Branches      20860    20305     -555     
============================================
- Hits          48836    47984     -852     
+ Misses        63008    62451     -557     
+ Partials       7320     7278      -42     

Flag	Coverage Δ
unit	25.03% <78.87%> (+0.03%)	⬆️

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[sonarqubecloud]

Quality Gate passed

Issues
5 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

[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/11735720931

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PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/11735720931
Status: success

[jenkins-is-staging]

Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/11735720931

[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/11739603482

[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/11739603482
Status: failure