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	2.046MiB	2.063MiB	-17.666KiB
Postgres (gzip)	817.387KiB	824.209KiB	-6.822KiB
Mysql	2.019MiB	2.034MiB	-15.495KiB
Mysql (gzip)	805.658KiB	812.033KiB	-6.375KiB
Sqlite	1.913MiB	1.929MiB	-16.638KiB
Sqlite (gzip)	764.973KiB	770.620KiB	-5.647KiB

[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.