Remove transmutes from vortex-io/runtime

[gatesn]

See https://without.boats/blog/the-scoped-task-trilemma/ for why we can't just have nice things like structured concurrency 😢

I therefore gave up scoping handles with artificial lifetimes and fall back to just holding a phantom lifetime in an open file handle. It still doesn't stop you passing a static future back out of a block_on call... which would then deadlock if you tried to poll it, but hey ho.

[codecov]

Codecov Report

❌ Patch coverage is 88.67403% with 41 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.94%. Comparing base (3206b0f) to head (91c0a59).
⚠️ Report is 11 commits behind head on develop.

Files with missing lines	Patch %	Lines
vortex-io/src/file/object_store.rs	0.00%	17 Missing ⚠️
vortex-io/src/runtime/single.rs	81.08%	7 Missing ⚠️
vortex-io/src/runtime/current.rs	70.58%	5 Missing ⚠️
vortex-io/src/runtime/smol.rs	40.00%	3 Missing ⚠️
vortex-io/src/runtime/tokio.rs	85.71%	3 Missing ⚠️
vortex-io/src/file/mod.rs	84.61%	2 Missing ⚠️
vortex-io/src/file/std_file.rs	80.00%	2 Missing ⚠️
vortex-io/src/runtime/tests.rs	98.98%	2 Missing ⚠️

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[robert3005]

How did you find that post? It's sad that it explains our problem precisely. !Leak in rust would have been cool.

[gatesn]

@onursatici sent it to me. There's a few other explanations on the various runtime issues, e.g. Tokio's

[codspeed-hq]

CodSpeed Performance Report

Merging #4572 will not alter performance

_{Comparing ngates/runtime-transmutes (91c0a59) with develop (7156645)}

Summary

✅ 1351 untouched benchmarks