feat: ✨ enum validation

[KANAjetzt]

Added enum validation, so enums can be used in Mod Configs.
Useful to define drop down selections.

https://json-schema.org/understanding-json-schema/reference/enum

Example Schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://example.com/sandwich-shop.schema.json",
  "title": "Sandwich Shop Menu",
  "description": "A schema representing sandwiches sold in a sandwich shop.",
  "type": "object",
  "properties": {
    "shopName": {
      "type": "string"
    },
    "location": {
      "type": "string"
    },
    "open": {
      "type": "boolean",
      "default": true
    },
    "menu": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "name": {
            "type": "string"
          },
          "breadType": {
            "type": "string",
            "enum": ["white", "whole_wheat", "rye", "sourdough", "gluten_free"]
          },
          "size": {
            "description": "Can be a string size label or a numeric inch size.",
            "enum": ["small", "medium", "large", 6, 12],
            "default": "medium"
          },
          "ingredients": {
            "type": "array",
            "items": { "type": "string" },
            "minItems": 2
          },
          "price": {
            "type": "number",
            "minimum": 1.0
          },
          "available": {
            "type": "boolean",
            "default": true
          }
        },
        "required": ["name", "breadType", "ingredients", "price"]
      }
    }
  },
  "required": ["shopName", "menu"]
}