Update SDK generator to OpenAPI Generator

[lordofweb]

Description

This PR proposes a major update of the SDK generator by migrating from swagger-codegen to OpenAPI Generator, while maintaining compatibility with the existing SDK structure.

Main changes:

• Migration from swagger-codegen to OpenAPI Generator
• PHP 8.1 support
• Addition of OpenAPI Generator configuration file (config-openapi-generator.yml)
• Creation of custom templates to maintain consistency with previously generated code
• Update of API models and endpoints

Technical benefits:

1. Generated code modernization

   • Full PHP 8.1 support
   • Better strict type handling
   • Cleaner and better documented code

2. Improved maintenance

   • Centralized configuration in config-openapi-generator.yml
   • Custom templates for better generated code control
   • Easier to update with future API versions

3. Best practices

   • Use of latest OpenAPI features
   • Improved documentation
   • Updated unit tests

How to test

To generate the SDK with the new configuration:

openapi-generator generate --skip-validate-spec -c config-openapi-generator.yml

Migration notes

• General SDK structure remains the same to maintain compatibility
• Namespaces and file organization are preserved
• Configuration is now more flexible and documented

Checklist

• OpenAPI Generator configuration set up
• Custom templates created
• PHP 8.1 support added
• Documentation updated
• Existing code structure preserved

[sonarcloud]

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 SonarQube Cloud