Highlight React events with the same wakeable ID

[taneliang]

Stack PR by STACK ATTACK:

• [Resize content][1/n] Break horizontal scrolling area into final-ish hierarchy #110 [Resize content][1/n] Break horizontal scrolling area into final-ish hierarchy
• [Resize content][2/n] Implement ResizableSplitView #107 [Resize content][2/n] Implement ResizableSplitView
• [Resize content][3/n] Sync horizontal pan and zoom states #108 [Resize content][3/n] Sync horizontal pan and zoom states
• Implement User Timing marks view #109 Implement User Timing marks view
• Highlight React events with the same wakeable ID #111 Highlight React events with the same wakeable ID

Summary

Resolves #44.

Intended to highlight all related React events. However, it looks like
separate promises can have the same wakeable ID, which is a bit strange.

TODO

• Ensure that we are correctly understanding wakeable IDs, i.e. that
  a unique resource/promise is a unique wakeable.
• Check if unstable_createResource caches promises.

Test Plan

• yarn lint
• yarn flow: no errors in changed code
• yarn start

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[taneliang]

Rebased on master.

We may want to use an intermediate highlight color for the related highlights in the future, so that it doesn't look like a bug in our highlighting logic