[w3c/manifest] Add field: public key (certificate) (#930)

The app manifest should provide an option for the app developer/owner to specify the certificate (public key) which will be used for HTTPS connections (similar to [HTTP Public Key Pinning (HPKP)](https://developer.mozilla.org/en-US/docs/Web/HTTP/Public_Key_Pinning)).

This would allow many of the apps currently bundling Electron to move (back) to PWAs while maintaining their high security standards (e.g. [E2E encrypted messenger Signal](https://community.signalusers.org/t/web-app-for-signal/1272/2)).

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