Export maps (objects) in addition to arrays

[Gideonnn]

Currently products and productTypes are exported as arrays, but they are used more often as maps. To prevent every consumer of the sdk having to reduce the products into an object, they should be exported as a map too.

// This can probably be made more type safe (e.g. product id's `as const`)
export const productsMap = generatedProducts.reduce((map, product: any) => {
  map[product.id] = product;
  return map;
}, {} as Record<string, any>);