fix(jans auth server): well known uppercase grant_types response_mode

[jmunozherbas]

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Description

Requesting /.well-known/openid-configuration for the first time returns unexpected output for grant_types_supported and response_mode_supported, it returns uppercase values.

Target issue

#2183

closes #2183

Implementation Details

Loading of grant_types_supported and response_mode_supported
was modified to List<String> in endpoint /.well-known/openid-configuration
because JSONArray loading was causing the issue.

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Test and Document the changes

• Static code analysis has been run locally and issues have been fixed
• Relevant unit and integration tests have been added/updated
• Relevant documentation has been updated if any (i.e. user guides, installation and configuration guides, technical design docs etc)

[sonarcloud]

[Jans authentication server parent] Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

0.0% Coverage
0.0% Duplication

[jmunozherbas]

I have tested build successfully in local and jenkins, I dont know the reason why build here is not working.