Is your feature request related to a problem? Please describe.

I've been using Faker::LoremPixel.image and Faker::Avatar.image for a while in my database seeds and a few months ago the avatar seeder stopped working (I think this is because robohash was moved to being hosted behind Cloudflare, and Cloudflare will sometimes reject requests from Ruby). I wanted to fix this issue by moving the avatar generator to LoremPixel, but it turns out LoremPixel is also having issues and timing out requests pretty often.

I think we should make the codebase simpler and make it easier to switch between these image generators by merging them into one Faker::Image class, with methods like lorem_pixel, robohash, etc. For LoremPixel, it might be a good idea to remove the generator entirely since the site has been so flaky over the years.

If you're adding new objects, please describe how you would use them

Faker::LoremPixel.image would become Faker::Image.lorem_pixel and Faker::Avatar.image would become Faker::Image.robohash. We should also probably move LoremFlickr and Placeholdit into this class.

# Before
Faker::Placeholdit.image(size: '50x50') #=> "https://placehold.it/50x50.png"
Faker::LoremFlickr.image(size: "50x60") #=> "https://loremflickr.com/50/60"
Faker::LoremPixel.image(size: "50x60") #=> "https://lorempixel.com/50/60"
Faker::Avatar.image(size: "50x50") #=> "https://robohash.org/randomstring?size=50x50&set=set1"

# After
Faker::Image.placehold_it(size: '50x50') #=> "https://placehold.it/50x50.png"
Faker::Image.lorem_flickr(size: "50x60") #=> "https://loremflickr.com/50/60"
Faker::Image.lorem_pixel(size: "50x60") #=> "https://lorempixel.com/50/60"
Faker::Image.robohash(size: "50x50") #=> "https://robohash.org/randomstring?size=50x50&set=set1"

I'd also like to add Unsplash as an image source, like faker.js has done.

Describe alternatives you've considered

Making my own generators, I guess? IMO, merging them into one class is the cleanest solution.

Additional context

I made a quick example for an unsplash method (should probably add validations):

class Faker
  class Image < Faker::Base
    class << self
      def unsplash(category: nil, width: 400, height: 400, keyword: nil)
        url = 'https://source.unsplash.com'
        url += "/category/#{category}" unless category.nil?
        url += "/#{width}x#{height}"
        url += "?#{keyword}" unless keyword.nil?
        url
      end
    end
  end
end