Add support for mount manager

So that

$ nerdctl run --snapshotter=erofs -it --rm docker.1ms.run/library/nginx:latest /bin/sh

can work now instead of erroring out as:
```
FATA[0000] failed to mount {Type:format/mkdir/overlay Source:overlay Target: Options:[lowerdir={{ overlay 0 6 }}]} on "/tmp/initialC2844197147": mount source: "overlay", target: "/tmp/initialC2844197147", fstype: format/mkdir/overlay, flags: 0, data: "lowerdir={{ overlay 0 6 }}", err: no such device
```

Signed-off-by: Gao Xiang <[email protected]>

Author: hsiangkao

pkg/cmd/container/run_mount.go

@@ -173,6 +173,16 @@ func generateMountOpts(ctx context.Context, client *containerd.Client, ensuredIm
 			return nil, nil, nil, err
 		}
 
+		mm := client.MountManager()
+
+		active, err := mm.Activate(ctx, tempDir, mounts)
+		if err == nil {
+			defer mm.Deactivate(ctx, tempDir)
+			mounts = active.System
+		} else if !errors.Is(err, errdefs.ErrNotImplemented) {
+			return nil, nil, nil, fmt.Errorf("failed to activate mounts: %w", err)
+		}
+
 		// windows has additional steps for mounting see
 		// https://github.com/containerd/containerd/commit/791e175c79930a34cfbb2048fbcaa8493fd2c86b
 		unmounter := func(tempDir string) {