Use objects instead of enums

[targos]

For example, convert:

export enum ImageColorModel {
  GREY = 'GREY',
  GREYA = 'GREYA',
  RGB = 'RGB',
  RGBA = 'RGBA',
  BINARY = 'BINARY',
}

to:

export const ImageColorModel = {
  GREY: 'GREY',
  GREYA: 'GREYA',
  RGB: 'RGB',
  RGBA: 'RGBA',
  BINARY: 'BINARY',
} as const;
export type ImageColorModel = typeof ImageColorModel[keyof typeof ImageColorModel];

This allows to use the enum values without importing the enum object.