[w3c/manifest] Add change log support to the web app manifest (#853)

Native applications typically have a way to show users it was recently updated - and for users to click through and see what's new. I'm proposing a new optional subtree in the web app manifest that allows web app developers to provide this info.

I've started a discussion on WICG [here](https://discourse.wicg.io/t/proposal-pwa-changelogs/4290). It includes a link to the [Microsoft Edge explainer](https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/master/VersionHistory/explainer.md).

As a summary here, the idea is that a PWA developer adds a URL under the `changelog` subtree of the web app manifest and a `version` value. The user agent/platform based on these two values will decide if a user should be notified of a new changelog, and provide a way to see what is pointed at by the URL.

This feature is proposed specifically to not interfere with https://github.com/w3c/manifest/issues/446. For more information, see existing issues on the Microsoft Edge Explainers [issues page](https://github.com/MicrosoftEdge/MSEdgeExplainers/issues?q=is%3Aissue+is%3Aopen+label%3A%22Version+History%22).

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