Add NodeJS parser to benchmarks.
Previous attempt #2724 did not work due CodSpeed producing very
inaccurate results (https://github.com/CodSpeedHQ/action/issues/96).
This version runs the actual benchmarks without CodSpeed's
instrumentation. Then another faux-benchmark runs within Codspeed's
instrumented action and just performs meaningless calculations in a loop
for as long as is required to take same amount of time as the original
uninstrumented benchmarks took.
It's unfortunate that we therefore don't get flame graphs on CodSpeed,
but this seems to be the best we can do for now.
Closes#2616.
Adds benchmarks for NodeJS NAPI build. Measurement includes `JSON.parse`
of the AST on JS side, since that's how it'll be used 99% of the time.
Benchmarks run against same files as Rust parser benchmarks, so we can
see the overhead of transferring AST to JS.
