[w3c/gamepad] GamepadHapticActuator pulse should support frequency parameter (#148)

Many haptic actuators support both pulsing at different frequencies, which provides a wider range of expressiveness in haptic feedback. The pulse function could easily be extended to support a 0..1 frequency value as well (which the UA could easily ignore if the hardware doesn't support different frequencies).

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https://github.com/w3c/gamepad/issues/148