add autosharding support

[Naireen]

Enable autosharding for BQ [new PR since https://github.com/apache/beam/pull/16795 was closed for being stale]

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Reminder, please take a look at this pr: @robertwb @chamikaramj

[Naireen]

R: @reuvenlax

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Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control

[chamikaramj]

What's the status of this ?