[w3c/manifest] Proposal: Add Optional Member for IARC Rating (#523)

It may be useful for web apps to be able to optionally indicate their [IARC](https://www.globalratings.com/) rating.  I'm thinking this may be as simple as: 

`"iarc_rating": "opaque_string",`

App stores participating in IARC include the Google Play Store, Windows Store, and Nintendo Store.

Locales covered by IARC include: Australia, Brazil, Germany, Europe (PEGI), and North America (ESRB)

For more on IARC:
* https://www.globalratings.com/intro-to-iarc-en.aspx
* https://www.globalratings.com/for-developers.aspx


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