Add reaction message support, improve type safety #35
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We were not surfacing reaction messages separately. This now allows processing user reactions separately from other message types.
Also, type safety when doing Reply and MarkRead wasn't great since users could attempt either operation on a message that doesn't support that kind of interaction (such as status or error messages). So we create two intermediate types, UserMessage (the ones users can interact with, like content and interactive messages), and SystemMessage (reaction, status, error and unsupported).
We also fix the sample to properly report the environment which for some reason is not Development despite envvars being set properly by the Azure Functions tools on local run.