[FL-1625] Overcurrent monitoring. Cli command for external 3.3v dcdc control. (#615)

* Apps: power observer for overcurrent monitoring
* Power: cli command for enable\disable externat 3.3v dcdc

Co-authored-by: あく <alleteam@gmail.com>

applications/power-observer/power-observer.c

@@ -0,0 +1,33 @@
+#include <furi.h>
+#include <api-hal.h>
+#include <notification/notification-messages.h>
+
+const NotificationMessage message_green_110 = {
+    .type = NotificationMessageTypeLedGreen,
+    .data.led.value = 110,
+};
+
+static const NotificationSequence sequence_overconsumption = {
+    &message_green_110,
+    &message_red_255,
+    &message_delay_100,
+    NULL,
+};
+
+int32_t power_observer(void* p) {
+    NotificationApp* notifications = furi_record_open("notification");
+
+    const float overconsumption_limit = 0.03f;
+
+    while(true) {
+        float current = -api_hal_power_get_battery_current(ApiHalPowerICFuelGauge);
+
+        if(current >= overconsumption_limit) {
+            notification_message_block(notifications, &sequence_overconsumption);
+        }
+
+        delay(1000);
+    }
+
+    return 0;
+}