Cannot track start/end of patch service calls

[rkrisztian]

When I do:

this.ngrxJsonApiService.patchResource({resource: animal, toRemote: true});

Then I have no way of knowing when the operation is started/finished. This is unlike the findOne and findMany operations where the StoreQuery interface has a loading field, which I can use to show the loading indicator. I need a similar solution for patch operations. For delete, it works fine.