IssueTracker

Our JSON, Studio summaries, and InstrumentationResults key/value pairs format always reports ints currently. This causes certain issues with benchmarks that report very low integers:

• Tiny fluctuations can be exaggerated by rounding (e.g. 9.46, 9.47, 9.51 looks like 9, 9, 10)
• Actual variance is hidden, which affects regression detection confidence
• Accuracy is limited by this precision

For jank specifically, we're limited to integer measurements by gfxinfo, b/195987329 tracks that work.

For Studio summaries, we may not always want to display many decimals, we can tweak that as we like.