[w3c/manifest] Representing Spatial Icons for WebApps (#763)

As a part of immersive-web group, there is a proposal to use spatial / 3D favicons for immersive-web pages/apps. See explainer here: https://github.com/immersive-web/spatial-favicons/blob/master/explainer.md

WebApps manifest today has "icons" member in the manifest, but is restricted to "Image Resources" as per spec. Our initial idea was to "re-use" this member to spatial icons as well, except that the mime type will be a non-image mime type and the sizes will have additional dimension. But the WebApp manifest explicitly says: "Image Resources" and there is an associated algorithm to handle intelligent fetching on need basis. 

There are couple of approaches:
1. Extend the "icons" member to include Non Image Resources.
2. Introduce a new "spatial-icon" member to avoid any confusion and let the "platform"/ User Agent make an appropriate decision on which resource to use.

We are open to other ideas and hoping to get some feedback from WebApp manifest spec authors.

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https://github.com/w3c/manifest/issues/763