[Optimize flamechart][1/4] Add flamechart to ReactProfilerData

[taneliang]

Stack PR by STACK ATTACK:

• 89 Fix lint failure from #88

• #90 [Optimize flamechart][1/4] Add flamechart to ReactProfilerData

• 91 [Optimize flamechart][2/4] Replace Speedscope types with custom stack frame type

• 92 [Optimize flamechart][3/4] Rename flame graph -> flame chart

• 93 [Optimize flamechart][4/4] Split FlamechartView into row views

Summary

This commit begins a stack of PRs that optimizes our flamechart. Broadly, we need to replace the use of Speedscope's flamechart types with our own types that are optimized for our rendering code.

As flamechart was always moved around together with ReactProfilerData, it makes sense to move flamechart into it. That also necessitates moving preprocessFlamechart into preprocessData.

This PR works towards #50.

Test Plan

• yarn flow: errors present, but no errors in affected code.
• yarn lint
• yarn start

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