add platform tag for logs

[EvanBacon]

Summary

• Depends on https://github.com/facebook/react-native/pull/42753
• Adds the ability to tag console logs with the origin platform.
• Here's a snippet of how we'd likely use it in Expo CLI. I'm not especially in love with the formatting, but it's better than no platform tag.

• Generally related (but not required for this feature in Metro) https://github.com/expo/expo/pull/26812

Test plan