[#189] localstorage: Implement DumpInfo method

Implement method to get the information about the local storage.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/local_object_storage/engine/info.go

@@ -0,0 +1,24 @@
+package engine
+
+import (
+	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard"
+)
+
+// Info groups the information about StorageEngine.
+type Info struct {
+	Shards []shard.Info
+}
+
+// DumpInfo returns information about the StorageEngine.
+func (e *StorageEngine) DumpInfo() (i Info) {
+	e.mtx.RLock()
+	defer e.mtx.RUnlock()
+
+	i.Shards = make([]shard.Info, 0, len(e.shards))
+
+	for _, sh := range e.shards {
+		i.Shards = append(i.Shards, sh.DumpInfo())
+	}
+
+	return
+}