Using Thermal Shutdown Manager APIs to get Thermal autoshutdown mode updates

The below steps need to be followed by applications to listen to thermal auto-shutdown mode updates.

### 1. Implement IThermalShutdownListener interface ###

class MyThermalShutdownModeListener : public IThermalShutdownListener {
public:
    void onShutdownEnabled() override;
    void onShutdownDisabled() override;
    void onImminentShutdownEnablement(uint32_t imminentDuration) override;
    void onServiceStatusChange(ServiceStatus status) override;
};

2. Get thermal factory and thermal shutdown manager instances

auto &thermalFactory = telux::therm::ThermalFactory::getInstance();
auto thermShutdownMgr_ = thermalFactory.getThermalShutdownManager();

3. Check if thermal shutdown management service is ready.

bool subSystemsStatus = thermShutdownMgr_->isReady();
 if(subSystemsStatus) {
     std::cout << " Thermal-Shutdown management service is ready."<< std::endl;
 } else {
     std::cout << " Thermal-Shutdown management service is NOT ready."<< std::endl;
 }

4. If Thermal shutdown management service is not ready, wait for it to be ready

std::future<bool> f = thermShutdownMgr_->onSubsystemReady();
#if  //Timeout based wait
    if (f.wait_for(std::chrono::seconds(timeoutSec)) == std::future_status::timeout) {
        std::cout << "operation timed out." << std::endl;
    } else {
        subSystemsStatus = f.get();
        if (subSystemsStatus) {
            std::cout << " Thermal-Shutdown management service is ready." << std::endl;
        }
    }
#else //Unconditional wait
    subSystemsStatus = f.get();
    if (subSystemsStatus) {
        std::cout << " Thermal-Shutdown management service is ready." << std::endl;
    } else {
        std::cout << " Thermal-Shutdown management service is NOT ready." << std::endl;
        return -1;
    }
#endif

### 5. Instantiate MyThermalStateListener ###

auto myThermalModeListener = std::make_shared<MyThermalShutdownModeListener>();

### 6. Register for updates on thermal autoshutdown mode and its management service status ###

thermShutdownMgr_->registerListener(myThermalModeListener);

### 7. Wait for the Thermal auto shutdown mode updates ###

// Avoid long blocking calls when handling notifications
void MyThermalShutdownModeListener::onShutdownEnabled() {
    std::cout << std::endl << "**** Thermal auto shutdown mode enabled ****" << std::endl;
}
void MyThermalShutdownModeListener::onShutdownDisabled() {
    std::cout << std::endl << "**** Thermal auto shutdown mode disabled ****" << std::endl;
}
void MyThermalShutdownModeListener::onImminentShutdownEnablement(uint32_t imminentDuration) {
    std::cout << std::endl << "**** Thermal auto shutdown mode will be enabled in "
        << imminentDuration << " seconds ****" << std::endl;
}

8. When the Thermal shutdown management service goes down, this API is invoked with status UNAVAILABLE. All Thermal auto shutdown mode notifications will be stopped until the status becomes AVAILABLE again

void MyThermalShutdownModeListener::onServiceStatusChange(ServiceStatus status) {
    std::cout << std::endl << "**** Thermal-Shutdown management service status update ****" << std::endl;
    // Avoid long blocking calls when handling notifications
}