LU-13814 clio: add coo_dio_pages_init

LU-13814 clio: add coo_dio_pages_init

Just like the cl_page it's replacing, the cl_dio_pages
struct needs various pieces of information from the
different layers of the cl_object in order to do the IO.

This adds the skeletion for coo_dio_pages_init.

Test-Parameters: trivial
Signed-off-by: Patrick Farrell <pfarrell@whamcloud.com>
Change-Id: I30251b4b9e1455f87768e488647296390352cf88
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/58530
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>