[@ngrx/data] - wrong type of filter$

[b-shanovskyi-andersen]

Minimal reproduction of the bug/regression with instructions:

In EntityCollectionServiceBase:

/** Observable of the filter pattern applied by the entity collection's filter function */
filter$: Observable<string> | Store<string>;

But filter can have any type:

/**
  * Set the pattern that the collection's filter applies
  * when using the `filteredEntities` selector.
  */
setFilter(pattern: any): void;

Expected behavior:

filter$: Observable<any> | Store<any>;

I would be willing to submit a PR to fix this issue

[ ] Yes (Assistance is provided if you need help submitting a pull request)
[X] No

[santoshyadavdev]

Hi @timdeschryver/ @brandonroberts ,
I will work on it.