add context handling

[xrstf]

This removes the TODO/Background contexts sprinkled throughout pkg/ and replaces them with a common context.Context parameter. The root command then uses the command's context for all the functions it calls.

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[dims]

/ok-to-test

[dims]

/approve
/lgtm

thanks @xrstf

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dims, xrstf

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