Add Compose-ImageLoader integration

[jan-tennert]

What kind of change does this PR introduce?

Feature (closes #309)

What is the current behavior?

N/A in master, coil-integration on developement (which only supports Android) (see #309)

What is the new behavior?

There is a new plugin: ImageLoaderIntegration, which can be added to a ImageLoader to display images from public and non-public buckets.

Create a new ImageLoader with the Supabase Fetcher. See the Compose-ImageLoader documentation for more information.

ImageLoader {
    //...
    components {
        add(keyer = supabaseClient.imageLoader)
        add(fetcherFactory = supabaseClient.imageLoader)
    }
    //...
}

You can easily display images from Supabase Storage like this:

AutoSizeImage(
    request = remember { ImageRequest(authenticatedStorageItem("icons", "user.png")) },
    contentDescription = null
)

Additional context

All Compose targets are supported.