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Load the category informaton in parallel with source load

Description

Load the category informaton in parallel with source load

And display the categories once source is loaded.

This helps to avoid a flicker in screen when categories
fetched and inserted after source is rendered.

Make use of the time while we wait for source article.

Bug: T90106
Change-Id: I9e37d4843a3515d1248c89e207f78986fec88bac