This datapack adds the ability to climb:

    ladder
    vine
    scaffolding
    weeping_vines
    weeping_vines_plant
    twisting_vines
    twisting_vines_plant
    cave_vines
    cave_vines_plant
    iron_bars
    copper_bars
    exposed_copper_bars
    weathered_copper_bars
    oxidized_copper_bars
    waxed_copper_bars
    waxed_exposed_copper_bars
    waxed_weathered_copper_bars
    waxed_oxidized_copper_bars
    iron_chain
    copper_chain
    exposed_copper_chain
    weathered_copper_chain
    oxidized_copper_chain
    waxed_copper_chain
    waxed_exposed_copper_chain
    waxed_weathered_copper_chain
    waxed_oxidized_copper_chain
    lightning_rod
    exposed_lightning_rod
    weathered_lightning_rod
    oxidized_lightning_rod
    waxed_lightning_rod
    waxed_exposed_lightning_rod
    waxed_weathered_lightning_rod
    waxed_oxidized_lightning_rod