crimson/net/io_handler: ctor add gate ctor with shard id

crimson/net/io_handler: ctor add gate ctor with shard id

IOHandler::to_new_sid provides a mechanism to switch to a new core from the current one used.
This behavior is tricky for making sure that we keep the IOHandler::shard_states_t::gate instance to be used on the same core that it was created.
In order to resolve this, we should be able to construct Gated out of specified core_id (and not from this_shard_id).

See: https://github.com/ceph/ceph/pull/58986#discussion_r1733782952

Signed-off-by: NitzanMordhai <nmordech@redhat.com>