[Proposed Feature] viewer for image/tiff files

[jedsundwall]

In-browser viewer for TIFF files which can render Cloud-Optimized GeoTIFFs and other varieties of TIFF if files have appropriate metadata.

[jedsundwall]

@cmsetzer please take a look at #169 as it's another approach to viewing imagery in a preview – albeit specifically focused on GeoTIFFs. Curious to get your take on how to create a generic viewer that can render things differently based on metadata included with images.