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konsti c94777fc54
Initialize rayon lazily (#9435) 
When performing a noop sync, we don't need the rayon threadpool, yet we
pay for its initialization:

![Screenshot from 2024-11-26
08-59-07](https://github.com/user-attachments/assets/d918f50d-b5b7-4bdd-820d-cbe71b633aaa)

Be making the initialization lazy, we avoid that cost:

![Screenshot from 2024-11-26
09-53-08](https://github.com/user-attachments/assets/193baea0-667f-4b9d-9a75-886a86f0f837)

This code runs every time before user code in `uv run`.

This means that before calling rayon, one now needs to call
`LazyLock::force(&RAYON_INITIALIZE);`.

Performance mode (CPU 0 is a perf core):
```
$ taskset -c 0 hyperfine --warmup 5 -N "/home/konsti/projects/uv/uv-main sync" "/home/konsti/projects/uv/target/profiling/uv sync"
Benchmark 1: /home/konsti/projects/uv/uv-main sync
  Time (mean ± σ):       4.5 ms ±   0.1 ms    [User: 2.7 ms, System: 1.8 ms]
  Range (min … max):     4.4 ms …   6.4 ms    640 runs
 
  Warning: Statistical outliers were detected. Consider re-running this benchmark on a quiet system without any interferences from other programs. It might help to use the '--warmup' or '--prepare' options.
 
Benchmark 2: /home/konsti/projects/uv/target/profiling/uv sync
  Time (mean ± σ):       4.4 ms ±   0.1 ms    [User: 2.7 ms, System: 1.6 ms]
  Range (min … max):     4.3 ms …   5.0 ms    679 runs
 
Summary
  /home/konsti/projects/uv/target/profiling/uv sync ran
    1.03 ± 0.04 times faster than /home/konsti/projects/uv/uv-main sync
```

Power saver mode:
```
$ hyperfine --warmup 5 -N "/home/konsti/projects/uv/uv-main sync" "/home/konsti/projects/uv/target/profiling/uv sync"
Benchmark 1: /home/konsti/projects/uv/uv-main sync
  Time (mean ± σ):      28.1 ms ±   1.2 ms    [User: 15.5 ms, System: 20.3 ms]
  Range (min … max):    25.7 ms …  31.9 ms    102 runs
 
Benchmark 2: /home/konsti/projects/uv/target/profiling/uv sync
  Time (mean ± σ):      24.0 ms ±   1.2 ms    [User: 13.8 ms, System: 9.9 ms]
  Range (min … max):    22.2 ms …  28.2 ms    122 runs
 
Summary
  /home/konsti/projects/uv/target/profiling/uv sync ran
    1.17 ± 0.08 times faster than /home/konsti/projects/uv/uv-main sync
```
2024-11-26 14:58:38 +00:00
..
src Initialize rayon lazily (#9435) 2024-11-26 14:58:38 +00:00
Cargo.toml Initialize rayon lazily (#9435) 2024-11-26 14:58:38 +00:00