[wpilib] Add BooleanEvent/Trigger factories on HID classes (#4247)

wpilibc/src/main/native/cpp/GenericHID.cpp

@@ -8,6 +8,7 @@
 
 #include "frc/DriverStation.h"
 #include "frc/Errors.h"
+#include "frc/event/BooleanEvent.h"
 
 using namespace frc;
 
@@ -30,6 +31,11 @@ bool GenericHID::GetRawButtonReleased(int button) {
   return DriverStation::GetStickButtonReleased(m_port, button);
 }
 
+BooleanEvent GenericHID::Button(int button, EventLoop* loop) const {
+  return BooleanEvent(loop,
+                      [this, button]() { return this->GetRawButton(button); });
+}
+
 double GenericHID::GetRawAxis(int axis) const {
   return DriverStation::GetStickAxis(m_port, axis);
 }