Add Create Image example to Demo app

[SunburstEnzo]

What

• Added ImageStore, follows same structure as ChatStore and MiscStore
• Added ImageView which is a list of being able to Create Images (this PR), and upcoming Create Image Edit and Create Image Variation (disabled, placeholder views)
• Uses SafariViewController to display image URL's when tapped though not ideal as not SwiftUI friendly
• ImagesResult.URLResult conforms to Hashable so I could use it in a list – may be better to map the url strings instead

Why

#49, most likely a popular feature

Affected Areas

ContentView, ImagesResult.URLResult

Like my Models DemoApp example, needs better error messaging

More than happy to tweak, especially in favour of nicer SwiftUI usage 👌

Preview:

[Krivoblotsky]

What do you think about having a chat-like interface, but with images as a result instead of texts? So you can type a prompt and get an image right in the chat?

[SunburstEnzo]

Yeah that's a good idea, I definitely thought about that initially but thought it might be overkill for the demo app? I wasn't sure how large the bottom keyboard-related area would end up being though. It could be that the (non-text/prompt) options are all in one context menu.

I'll have a think and see what I can mock up.

[Krivoblotsky]

We can refer to Apple's Messages app here, what do you think? @DJBen do you have any thoughts?

[SunburstEnzo]

We could use the Link Presentation framework to display the images like that too https://developer.apple.com/documentation/linkpresentation

[SunburstEnzo]

Link Presentation isn't super friendly with SwiftUI but found a few resources online to get it working, so it is a viable option (just obviously then in the chat format rather than this table format)

[SunburstEnzo]

The options for chat-style interaction is my main question though, something like this? Or "…" icon?
For image editing a "photo album" icon next to "..." could be a good answer that then covers both use cases