Add configuration flow abilites to the ld2410 component (#4434)

esphome/components/ld2410/number/light_threshold_number.cpp

@@ -0,0 +1,12 @@
+#include "light_threshold_number.h"
+
+namespace esphome {
+namespace ld2410 {
+
+void LightThresholdNumber::control(float value) {
+  this->publish_state(value);
+  this->parent_->set_light_out_control();
+}
+
+}  // namespace ld2410
+}  // namespace esphome