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gc: add graceful shutdown

We call `gc_shutdown` after all client shutdown fibers is finished. So
shutdown is quite simple, we just need to finish checkpoint system
fibers.

There may be a checkpoint in progress during shutdown. It can by done in
`checkpoint_daemon` fiber or in client fiber. Anyway we just need to
make sure it is cancellable. In case of memtx we run checkpoint in
distinct cord but thanks to `cord_cojoin` semantics cancel is propagated
to the cord's main fiber. So let's add a yield to the `checkpoint_f` to
make it cancellable.

Now we don't need `checkpoint_cancel` at all. At the moment of
memtx_engine_shutdown (actually freeing resources) the cord is sure to
be terminated.

Part of #8423

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