Add AuthenticatorAdapterService to get authentiactor instance for user defined authenticators.

[Thisara-Welmilla]

Issue:

• Add AuthenticatorAdapterService to get authentiactor instance for user defined authenticators. product-is#22330

With the custom authentocation extenstion support, there will be user defined authenticators engaging in the authentication flow. We need to introduce new service to get the authenticator instance for user defined authenticator.

[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/12891326226

[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/12891326226
Status: failure

[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/12961849190

[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/12961849190
Status: failure

[sonarqubecloud]

Quality Gate failed

Failed conditions
5.8% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud

[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/12961962993

[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/12961962993
Status: failure

[codecov]

Codecov Report

Attention: Patch coverage is 29.75207% with 85 lines in your changes missing coverage. Please review.

Project coverage is 46.20%. Comparing base (ca50524) to head (5f1d660).
Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
...internal/core/ApplicationAuthenticatorManager.java	50.00%	16 Missing and 1 partial ⚠️
.../authentication/framework/util/FrameworkUtils.java	12.50%	14 Missing ⚠️
...on/framework/ApplicationAuthenticationService.java	31.25%	11 Missing ⚠️
...ework/config/model/OptimizedApplicationConfig.java	0.00%	9 Missing ⚠️
.../framework/internal/FrameworkServiceComponent.java	0.00%	8 Missing ⚠️
...uthentication/framework/AuthenticationService.java	30.00%	7 Missing ⚠️
...n/framework/cache/AuthenticationContextLoader.java	0.00%	5 Missing ⚠️
...ramework/handler/step/impl/DefaultStepHandler.java	42.85%	3 Missing and 1 partial ⚠️
...work/config/loader/UIBasedConfigurationLoader.java	66.66%	2 Missing and 1 partial ⚠️
...framework/internal/FrameworkServiceDataHolder.java	0.00%	3 Missing ⚠️
... and 2 more

❌ Your patch check has failed because the patch coverage (29.75%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6319      +/-   ##
============================================
- Coverage     46.27%   46.20%   -0.07%     
- Complexity    14712    14765      +53     
============================================
  Files          1701     1709       +8     
  Lines        104292   104789     +497     
  Branches      18342    18567     +225     
============================================
+ Hits          48259    48417     +158     
- Misses        49180    49480     +300     
- Partials       6853     6892      +39     

Flag	Coverage Δ
unit	29.87% <29.75%> (+<0.01%)	⬆️

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