[w3c/manifest] Allow for multiple scopes (#449)

There are some cases where a web app could have multiple scopes.  
  * In one case, a web app (scope:Example.com) might have a CDN (scope:ExampleCDN.com), personal data (scope:MyExample.com), etc. that is served from a second domain.  
  * In another case, a web app (scope:Chat.Example.com) might have peer subdomains that are in-scope (scope:Music.Example.com and scope:Video.Example.com) but might also have peer domains that are out-of-scope (scope:Events.Example.com) 

PROPOSAL: Add an “additional_scopes” array element for web app developers to optionally specify additional scopes
FAQ: 
Q: Why not replace the current scope object with a scopes array?
A: We do not want to break backwards compatibility with implemented manifests that use scope
Q: What might this look like?
A: 
`
"scope": ... ,
`
`
"additional_scopes": [ ... ],
`

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https://github.com/w3c/manifest/issues/449