Fix perfetto output for using in ff profiler

[jpcamara]

• Firefox Profiler requires a "traceEvents" key and that every row has a "name" key (which is not required by the perfetto spec for "E" phases)

• The spec doesn't require those https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/edit?pli=1 but the firefox profiler code does

  • https://github.com/firefox-devtools/profiler/blob/358a1c77111edf944d09fbe79012a08832a9cb59/src/profile-logic/import/chrome.js#L232 (traceEvents is how it determines it is perfetto or "chrome")
  • https://github.com/firefox-devtools/profiler/blob/358a1c77111edf944d09fbe79012a08832a9cb59/src/profile-logic/import/chrome.js#L249 (it at least requires "name" to be an empty string, but when empty it does not output properly in firefox profiler)

• WIP - it's not fully functional yet - it also is more a proof of concept right now since the changes i'll have for Ruby 3.3 will probably refactor away from thead locals, so this code will change as well

[jpcamara]

Once finished, this handles Add support for producing data in a format readable by the [Firefox Profiler](https://profiler.firefox.com/) or [Speedscope](https://www.speedscope.app/) here https://github.com/ivoanjo/gvl-tracing/issues/13

[ivoanjo]

Btw now that Ruby 3.3 support seems to be in good shape, I'd love to get this in as well ;) (no pressure! haha)