[plt-dev] typed scheme wrapper for file/gif

Attached is the typed scheme wrapper for file/gif.

One challenge I ran into is that I needed argb-bytes? as an opague type but
it's not exported.  I couldn't find how to define an function as an opague
type within the same module, so I had to patch file/gif to export
argb-bytes? instead.

Let me know if there are different way of handling this issue.  Thanks,
yc
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