OZG-5012 migrate api save to ngrx

...in-settings/src/lib/postfach/postfach-resource.service.ts

alfa-client/libs/tech-shared/src/lib/ngrx/actions.ts

alfa-client/libs/tech-shared/src/lib/ngrx/effects.service.ts

...-client/libs/tech-shared/src/lib/ngrx/resource.effects.ts

...-client/libs/tech-shared/src/lib/ngrx/resource.reducer.ts

alfa-client/libs/tech-shared/src/lib/ngrx/selector.ts

alfa-client/libs/tech-shared/src/lib/ngrx/state.model.ts

alfa-client/libs/tech-shared/src/lib/ngrx/state.service.ts

...libs/tech-shared/src/lib/resource/api-resource.service.ts

...lient/libs/tech-shared/src/lib/resource/resource.model.ts

.../libs/tech-shared/src/lib/resource/resource.repository.ts

...ent/libs/tech-shared/src/lib/resource/resource.service.ts