Add a configuration option to customize food values

[MelnCat]

It would be tremendously useful if configuration options to customize the hunger, saturation, and effects of every food item was added.
Currently, to achieve this, plugins must cancel consume item events, add hunger, and subtract the item manually. This isn't the best, as it causes plugin incompatibilities and glitches relating to food consumption. Having modification of food levels via a configuration option would be useful, as it wouldn't be required to cancel food consumption events, and it would be more performant.
It could also be pretty useful to have a configuration option relating to having certain items always edible, but those mechanics are client-side, so that wouldn't likely be possible.
The configuration option would likely be empty by default, indicating no overrides.
The format could look something similar to:

food-levels:
  bread:
    hunger: 3
    saturation: 2
  cookie:
    hunger: 5
    saturation: 5
    effects:
      mining_fatigue:
        duration: 20 # ticks
        amplifier: 0
        show-icon: false
        show-particles: false
     speed:
        duration: 100
        amplifier: 1

Edible blocks such as cake could also be included.

[BillyGalbreath]

Implemented in build 1515, but perfected in build 1516 ;)

https://github.com/PurpurMC/Purpur/blob/b3042f20eb9abd16e43816c01111815d5ff2ea7f/patches/server/0261-Configurable-food-attributes.patch

This new food-properties section is built to be overrides. This means the option will be empty by default to get vanilla default values. Add a food that you want to override, and set only the values you want to override. Everything not overridden will remain at vanilla default values.

Note about effects. To remove a vanilla effect you must specify a negative duration, or a 0.0 or negative chance.

Here's all the options explained with comments:

settings:
  food-properties:
    spider_eye:                 # the food to edit
      nutrition: 2              # this is the amount of hunger points restored
      saturation-modifier: 0.8  # The amount of saturation to restore. Equation used is "nutrition * saturation-modifier * 2"
      is-meat: false            # marks a food as edible for wolfs
      can-always-eat: false     # marks if this food can be eaten even at full hunger
      fast-food: false          # how long it takes to eat food (false: 32 ticks, true: 16 ticks)
      effects:                  # list of all the effects to be applied when eaten (can have multiples, like golden enchanted apples)
        poison:                 # effect to apply
          duration: 100         # duration of effect (in ticks)
          chance: 1.0           # chance for effect to be applied (0.0 - 1.0)
          visible: true         # shows particles
          amplifier: 0          # amplification of effect
          ambient: false        # true to make particles less obtrusive on screen (like beacon effects)
          show-icon: true       # show effect icon on HUD

Example of changing the nutrition value:

settings:
  food-properties:
    apple:
      nutrition: 8

Example of changing the duration of an effect:

settings:
  food-properties:
    spider_eye:
      effects:
        poison:
          duration: 200

Example of how to remove a vanilla effect:

settings:
  food-properties:
    enchanted_golden_apple:
      effects:
        resistance:
          duration: -1

I've taken the liberty to compile a list of all the vanilla food properties in this yaml format. It can be viewed at this gist: https://gist.github.com/BillyGalbreath/4fdfba991bd020e814eabf5143e3b225