Add variable speed rails for minecart in 24w33a

    I really like the fact that in 24w33a, you can now change the maximum minecart speed. Therefore, I propose adding variable speed rails to create minecarts that can reach practical speeds even in survival mode with cheats turned off.

    These rails can change their maximum speed depending on the strength of the redstone power given to them, allowing them to go faster than they currently do, or conversely, to maintain a slower speed. If you use diamonds to craft them, you can increase the value of diamonds and prevent this rail from being used in the early stages.

    I hope that the addition of these rails will make minecarts a convenient means of transportation(use google translate).