- Move map stats into a separate panel
- Don't handle selection events twice
- Simplify map-stats panel html

Change-Id: I0cd135727e69c8e42d34af3b75d42861ce06f8e4
Bug: v8:10644
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2485075Reviewed-by: Sathya Gunasekaran  <gsathya@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70717}