GODT-35: New pmapi client and manager using resty

pkg/pmapi/manager_ping.go

@@ -0,0 +1,11 @@
+package pmapi
+
+import "context"
+
+func (m *manager) testPing(ctx context.Context) error {
+	if _, err := m.r(ctx).Get("/tests/ping"); err != nil {
+		return err
+	}
+
+	return nil
+}