Add support for average ailment stacks on capped ailments

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Is your feature request related to a problem?

Ingame due to the probabilistic nature of inflicting ailments (<100% chance) your number of stacks inflicted can change between any given number e.g. 0-1 stacks for an ignite build with low chance. But as stacks are truncated at one almost always average stacks are less than one. Factoring this will give chance to inflict ailments a better indication in dps for low values.

Stacks vs Chance

Describe the solution you'd like

Proper calculation of these average stacks that is at least reasonably accurate like the simulation is. Getting a direct formula might be possible if you consider the maximum stack counts separately but it is a hard probability problem to solve.

Describe alternatives you've considered

No response

Additional context

Script to generate graph beforehand

import random

max = 1000000
chance = 0.5
intervalTime = 1/33
attackTime = 0.75
duration = 4
cap = 2

f = open("out.txt", "w")

for j in range(0, 100):
    stacks = [ ]
    chance = j / 100
    lastAttackTime = 0
    time = 0
    average = 0
    print(chance)
    for i in range(0, max):
        if lastAttackTime <= time:
            lastAttackTime = time + attackTime
            if random.random() < chance: 
                stacks.append(time)

        for v in stacks:
            if v + duration < time:
                stacks.remove(v)

        averageStack = min(cap, len(stacks))

        average += averageStack

        time += intervalTime
    average /= max

    f.write("{:.6f}".format(average))
    f.write("\n")

f.close()

Sheet with data https://docs.google.com/spreadsheets/d/15rNcc18PqFRU2f9NCbd-T0WU2-d0_iGT1Tb99I9ca4c/edit?usp=sharing

No implementation file, test, or entry point is named. Start by locating the capped ailment stack calculation in the Path of Building code and compare it with the provided simulation; done means average stacks are calculated for capped ailments and produce reasonably accurate results across different infliction chances.