Add support for image-to-image using xlabs-ai/flux-dev-controlnet

[lzell]

How to generate an image from a reference image using Flux ControlNet on Replicate

There are many controls to play with for this use case. Please see ReplicateFluxDevControlNetInputSchema.swift for the full range of controls.

import AIProxy

let replicateService = AIProxy.replicateService(
    partialKey: "partial-key-from-your-developer-dashboard",
    serviceURL: "service-url-from-your-developer-dashboard"
)
do {
    let input = ReplicateFluxDevControlNetInputSchema(
        controlImage: URL(string: "https://example.com/your/image")!,
        prompt: "a cyberpunk with natural greys and whites and browns",
        controlStrength: 0.4
    )
    let output = try await replicateService.createFluxDevControlNetImage(
        input: input
    )
    print("Done creating Flux-ControlNet image: ", output)
}  catch AIProxyError.unsuccessfulRequest(let statusCode, let responseBody) {
    print("Received non-200 status code: \(statusCode) with response body: \(responseBody)")
} catch {
    print("Could not create Flux-ControlNet image: \(error.localizedDescription)")
}