[UNOMI-899] Replace jaxrs-analyzer-maven-plugin with an alternative for Swagger documentation generation

[jayblanc]

With Karaf 4.4.8 upgrade, Apache CXF provides a new cxf-rt-rs-service-description-openapi-v3 which can replace the previously used jaxrs-analyzer-maven-plugin for Swagger/OpenAPI documentation.

This PR includes:

• Replacement of Swagger documentation generation with CXF's OpenAPI integration
• Override of swagger-initializer.js to ensure Unomi's API documentation loads correctly (fixes issue with default petshop sample)
• Upgrade of Apache CXF to 3.6.8 for compatibility between Swagger Core (2.2.34) and Jackson (2.18.2)
• Addition of docker-compose-cluster.yml for cluster testing
• Addition of BUILD file at package root for easy build identification in Docker images

Also fixes:

• Swagger UI no longer supports query params
• Swagger Core/Jackson incompatibility (related issue)

---

• I hereby declare this contribution to be licensed under the Apache License Version 2.0, January 2004