[w3c/manifest] Related applications members (#877)

The following members:
 
 * `related_applications`
 * `prefer_related_applications` 

Are single engine right now, so we need to poke other implementers about their level of interest and if they could be useful.  

They are perhaps also related to? 
https://wicg.github.io/get-installed-related-apps/spec/index.html


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