Upload files for context

[clarkmcc]

Currently we support a warm-up prompt where you can prompt where you can pre-condition the model before chatting with it. You can drop big text summaries in that model and then ask questions about the text, but this is difficult if there's a lot of text. It would be great if we supported file uploads. Let's start with .txt and .pdf. We won't be able to handle images in PDFs yet, but we should be able to at least deal with the text for now.