Show how to use hosting for AddAzureOpenAIClient and AddImageGenerator #49445
Description
Show how to use this stuff with hosting, by using things like AddAzureOpenAIClient and AddImageGenerator similar to https://github.com/ericstj/imageGeneratorSample/blob/8a976997f5a762885c2fa3e76c206723263c3ded/imageGeneratorSample.Web/Program.cs#L16-L26.
Originally posted by @ericstj in #49391 (comment)