[FL-3925, FL-3942, FL-3944] JS features & bugfixes (SDK 0.2) (#4075)

* feat: JS GPIO PWM, JS GUI Widget view; fix: JS EvtLoop stop on request, JS EvtLoop stop on error
* fix: f18 build
* docs: widget
* fix: js unit test
* change feature naming

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

targets/f18/furi_hal/furi_hal_resources.h

@@ -2,6 +2,7 @@
 
 #include <furi.h>
 #include <furi_hal_adc.h>
+#include <furi_hal_pwm.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -40,6 +41,7 @@ typedef struct {
     const GpioPin* pin;
     const char* name;
     const FuriHalAdcChannel channel;
+    const FuriHalPwmOutputId pwm_output;
     const uint8_t number;
     const bool debug;
 } GpioPinRecord;