[Google Play Store API] Allow to search for `top_charts` for different categories

[marm123]

Currently, the Google Play Store API works in a way where you can only extract top_charts for the specific store when the apps_category, movies_category, or books_category parameters are not provided. However, there are still top_charts for specific categories in Google Play:

Results with "store":"apps", "apps_category":"ART_AND_DESIGN", and "chart":"topselling_free"

Actual results for this category from Google Play:

Playground - no results Playground with no category | Inspect with no category

[andypple83]

Will priority this issue when customer requested.