Extend VS Code Channel APIs to enable support for custom KogitoEditorChannelApi implementations

SWEditor will need a CatalogService started behind the scenes to check which are the services/functions available in the project. This Catalog Service should be started by the channel.

The current state of the extensions api, only allow providing services by extending the existing KogitoEditorChannelApi interface. We need to enable support for custom KogitoEditorChannelApi so we can add access to the service catalog through a different KogitoEditorChannelApi implementation without affecting the other vscode extensions-