Support saving MIME types in shares about sunder HOT 4 OPEN

@GabeIsman Do you need anything from @FredericJacobs to implement this? I agree this would be a nice feature to have, but I don't think it's critical for 1.0.

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We already have support for this in RustySecrets so I don't think so.

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Yup! As I noted above, this ready for UI implementation.

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I have this implemented in a branch, but it's blocked on #141 which simplifies the file input component somewhat.

One question I have is what to do with the mime type on the recover/export side. One obvious feature would be to infer the file extension when saving the recovered secret file to disk.

We could also consider rendering the file since electron/chrome is pretty good at displaying images, pdfs, html documents, etc.., given a mime type, but since that is tantamount to embedding remote content, we would need to be very careful to mitigate against malicious inputs.

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