[#255] services/audit: Implement task manager

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

pkg/services/audit/taskmanager/push.go

@@ -0,0 +1,13 @@
+package audittask
+
+import (
+	"github.com/nspcc-dev/neofs-node/pkg/services/audit"
+)
+
+// PushTask adds a task to the queue for processing.
+//
+// Returns error if task was not added to the queue.
+func (m *Manager) PushTask(t *audit.Task) error {
+	m.ch <- t
+	return nil
+}