RDMA/core: Add Completion Counters to resource tracking

Track completion counter objects in the resource tracking database so
they are visible through the rdma netlink interface. The rdma tool
displays the comp_cntr count in the resource summary.

Add RDMA_RESTRACK_COMP_CNTR type, embed rdma_restrack_entry in
ib_comp_cntr, and add the res_to_dev mapping. Register the resource
on create and remove it on destroy.

Reviewed-by: Yonatan Nachum <ynachum@amazon.com>
Signed-off-by: Michael Margolin <mrgolin@amazon.com>
Link: https://patch.msgid.link/20260722083603.30334-5-mrgolin@amazon.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

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