feat: add thermal states to powerMonitor (#37935)

* feat: add thermal states to powerMonitor

* update docs

lib/browser/api/power-monitor.ts

@@ -4,6 +4,7 @@ const {
   createPowerMonitor,
   getSystemIdleState,
   getSystemIdleTime,
+  getCurrentThermalState,
   isOnBatteryPower
 } = process._linkedBinding('electron_browser_power_monitor');
 
@@ -40,6 +41,10 @@ class PowerMonitor extends EventEmitter {
     return getSystemIdleState(idleThreshold);
   }
 
+  getCurrentThermalState () {
+    return getCurrentThermalState();
+  }
+
   getSystemIdleTime () {
     return getSystemIdleTime();
   }