Describe the solution you'd like
Currently, all numerical perks are applied in an additive manner.

I propose that a way to apply scaling numerical values be implemented.

Ex:

[[Perks.For_Event.RANGED_TO_MOBS.archery]]
    applies_to = ["minecraft:bow", "mineraft:crossbow", "minecraft:trident"]
    perk = "pmmo:damage_boost"
    per_level = 0.01
    base = 1.0
    multiplicative = true

So at level 10 Archery it would be a 1.1x multiplier to the damage of bows, crossbows, and tridants.

Why is this feature needed
A way to make Perk bonuses so that they don't make the initial value less important than the bonus being applied.