[FEATURE]: Enum for non string types

[jabdinghoff]

An enum that is not of type string currently just gets turned into that type. I would love if these would also get turned into proper enums

Context

{
  "$schema": "http://json-schema.org/draft-06/schema#",
  "type": "object",
  "properties": {
    "foo": {
      "type": "number",
      "enum": [0,1,2,3]
    },
    "bar": {
      "type": "string",
      "enum": ["0","1", "2", "3"]
    }
  }
}

Input Format: schema
Output Language: typescript

Description

I have a lot of data that uses integers to represent different states, I would love if quicktype would also support this jsonschema feature.

Current Behaviour / Output

export interface FooSchema {
    bar?: Bar;
    foo?: number;
    [property: string]: any;
}

export enum Bar {
    The0 = "0",
    The1 = "1",
    The2 = "2",
    The3 = "3",
}

Proposed Behaviour / Output

export interface FooSchema {
    bar?: Bar;
    foo?: Foo;
    [property: string]: any;
}

export enum Foo {
    The0 = 0,
    The1 = 1,
    The2 = 2,
    The3 = 3,
}

export enum Bar {
    The0 = "0",
    The1 = "1",
    The2 = "2",
    The3 = "3",
}

And similarly for other languages

[ajeethcs]

Can I work on this?