fix: remove actor system for transactions, refactor iTX and tracing

[aqrln]

This reverts commit e1242e1 and re-applies #4940.

Integration: prisma/prisma#25285

Fixes: https://github.com/prisma/team-orm/issues/1270
Fixes: prisma/prisma#23792
Fixes: #4336
Fixes: prisma/prisma#21402
Fixes: prisma/prisma#20694
Closes: https://github.com/prisma/team-orm/issues/1285

/integration

[github-actions]

WASM Query Engine file Size

Engine	This PR	Base branch	Diff
Postgres	2.692MiB	2.708MiB	-15.700KiB
Postgres (gzip)	1.029MiB	1.036MiB	-7.182KiB
Mysql	2.020MiB	2.035MiB	-14.696KiB
Mysql (gzip)	806.490KiB	812.539KiB	-6.049KiB
Sqlite	1.913MiB	1.928MiB	-15.622KiB
Sqlite (gzip)	764.739KiB	770.432KiB	-5.694KiB

[codspeed-hq]

CodSpeed Performance Report

Merging #5001 will not alter performance

_{Comparing integration/itx-refactor (d9c03d9) with main (031f4d3)}

Summary

✅ 11 untouched benchmarks

[jkomyno]

I'm waiting for #5003 before being able to release a new integration version.