Add Inner Ring code

cmd/neofs-node/modules/node/placement.go

@@ -0,0 +1,28 @@
+package node
+
+import (
+	"github.com/nspcc-dev/neofs-node/pkg/services/object_manager/placement"
+	"go.uber.org/dig"
+)
+
+type (
+	placementToolParams struct {
+		dig.In
+
+		Placement placement.Component
+	}
+
+	placementToolResult struct {
+		dig.Out
+
+		Placer *placement.PlacementWrapper
+	}
+)
+
+func newPlacementTool(p placementToolParams) (res placementToolResult, err error) {
+	if res.Placer, err = placement.NewObjectPlacer(p.Placement); err != nil {
+		return
+	}
+
+	return
+}