California will not stop taxing its citizens. The state slaps a 63-cent fee on every gallon of gas. Sales taxes exceed 10 percent in some cities. The state’s highest earners pay a double-digit marginal rate to Sacramento on top of what they owe the feds.One group, more than any other, has cashed in on this arrangement: California’s public-sector unions. For them, higher taxes are good business. More taxes means more state workers, which means mo…