Introduce registration framework and registration flow management service

[ThaminduR]

Proposed changes in this pull request

The Registration Framework manages user self-registration and organization-specific registration flows. This PR introduces the registration framework component and add the implementation for the registration flow management service.

Related Issue

[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/13581328651

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 47.22%. Comparing base (4510dba) to head (c3a94d7).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
...on/identity/central/log/mgt/utils/LoggerUtils.java	0.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) 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    #6568      +/-   ##
============================================
- Coverage     47.24%   47.22%   -0.02%     
+ Complexity    15419    15401      -18     
============================================
  Files          1757     1757              
  Lines        105790   105837      +47     
  Branches      19962    19985      +23     
============================================
+ Hits          49983    49985       +2     
- Misses        48750    48799      +49     
+ Partials       7057     7053       -4     

Flag	Coverage Δ
unit	30.62% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/13581650046

[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/13581328651
Status: cancelled

[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/13581650046
Status: success

[jenkins-is-staging]

Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/13581650046

[sonarqubecloud]

Quality Gate passed

Issues
17 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
1.9% Duplication on New Code

See analysis details on SonarQube Cloud