add podman volume reload to sync volume plugins

Libpod requires that all volumes are stored in the libpod db. Because
volume plugins can be created outside of podman, it will not show all
available plugins. This podman volume reload command allows users to
sync the libpod db with their external volume plugins. All new volumes
from the plugin are also created in the libpod db and when a volume from
the db no longer exists it will be removed if possible.

There are some problems:
- naming conflicts, in this case we only use the first volume we found.
  This is not deterministic.
- race conditions, we have no control over the volume plugins. It is
  possible that the volumes changed while we run this command.

Fixes #14207

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

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