Copper blocks should have their own tag

it would be very convenient to be able to select categories of copper blocks without having to worry about their state, like being able to target copper blocks under #cut_copper, #cut_copper_stairs, or #cut_copper_slabs.

for instance, if you were in a creative world with a roof made out of copper blocks, you could select all the different stages of roof tiles under #cut_copper_stairs, instead of needing to select for cut_copper_stairs, exposed_cut_copper_stairs, weathered_cut_copper_stairs, and oxidized_cut_copper_stiars with their own separate fill commands.

given how easy this would be to implement and the quality of life it would bring I believe this would be a very nice tweak for creative players