Change CategorySearch url to an object type

**Issue Type:**

Enhancement

**Platform:**

Web

**Description:**

Currently `CategorySearch` sets its url as a string. This is true even if the suggestion selected belonged to a category. Now, if the page is refreshed the search will happen for all categories `*` thereby leading to inconsistent results.

The same behavior puts some limitations on when one would want to redirect to different route with `onValueSelected`. There is no way to tell the new page on which category to perform the search.

**Reactivesearch version:** x.y.z

2.6.12