Android - Implement preloading of xBlocks on unit navigation screen

Description

Implement preloading of next & previous xBlocks 3-5 blocks. This will increase the user experience significantly.

Dev Notes:
Inside the code, `ViewPagerDownloadManager` is the class that is currently disabling the pre-loading behavior of our ViewPager for unit navigation. This class needs to be studied and refactored or removed (with all its references and supporting code) as part of this ticket.

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Assignee

Mian Khalid

Reporter

Mian Khalid

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