feat add sandbox api status func

Signed-off-by: rongfu.leng <rongfu.leng@daocloud.io>

pkg/cri/store/sandbox/status.go

@@ -99,6 +99,10 @@ type Status struct {
 	Pid uint32
 	// CreatedAt is the created timestamp.
 	CreatedAt time.Time
+	// ExitedAt is the stop timestamp
+	ExitedAt time.Time
+	// ExitStatus is the stop sandbox status
+	ExitStatus uint32
 	// State is the state of the sandbox.
 	State State
 }