[REQ] Add support for Angular Resource API

Is your feature request related to a problem? Please describe.

I would love to implement the newest features of Angular in my API client using the Resource API or even better the new HttpResource introduced in Angular v19.2, but currently there is no support of this feature.

Describe the solution you'd like

I want to be able to generate my client either using the standard HttpClient or using the new Resource. Or perhaps even generate both. I think it would be nice to then have them as services and inject them into the angular components (as it is right now for the HttpClient)

Describe alternatives you've considered

There isn't really any well established library which supports this feature yet. So currently I am just manually creating my client by myself.

Update:
this feature is available at ng-openapi using the plugin @ng-openapi/http-resource
Documentation: ng-openapi.dev

Additional context

Start by reviewing the existing Angular HttpClient generation and compare it with Angular's Resource API and HttpResource documentation linked in the issue. Define whether generated clients should support Resource, HttpResource, or both, and verify that the selected approach can be used as injectable services in Angular components.