Change `Dice.apply_functions` to allow an changes in total chance

[Peilonrayz]

Currently the function is instructing us to use it in the following way. Whilst this is convenient it doesn't allow changes to the total chance of the dice.

print(
    Dice.from_dice(6)
        .apply_functions(
            {(1,): lambda _: Dice.from_dice(6)},
            lambda d: d,
        )
)

This should require a call to Dice.as_total_chance, or specifying the total chance at creation, as the chance for the result of 1 doesn't jump from 1/6 to 1 which is what the code is saying. This would change usage to:

print(
    Dice.from_dice(6)
        .apply_functions(
            {(1,): lambda d: Dice.from_dice(6, d)},
            lambda d: d,
        )
)

---

I do not think that Dice.apply_dice needs to change for the above reasons. This is because to be able to find the actual chance is the job of apply_dice, and would make it needlessly complex. However it should be checked that an increased chance is allowed to work.

print(
    Dice.from_dice(3)
        .apply_dice(
            {(1,): Dice.from_dice(4, 2)},
            Dice.from_dice(6),
        )
)

To:

Dice[4/3](
  1: 27.8%  5/18
  2: 27.8%  5/18
  3: 27.8%  5/18
  4: 27.8%  5/18
  5: 11.1%  1/9
  6: 11.1%  1/9
)

[Peilonrayz]

The above has been implemented. Please note that whilst the above form for apply_functions works so does the following. Note that @ changes the total chance the same way as_total_chance and creating a new dice with a specified total chance, like above, do.

d6 = Dice.from_dice(6)
print(
    d6.apply_functions(
        {(1,): lambda d: d6 @ d},
        lambda d: d,
    )
)