feat: Make Ctx journal generic

[rakita]

No description provided.

[github-actions]

Valgrind Results:

==4711== Cachegrind, a high-precision tracing profiler
==4711== Copyright (C) 2002-2017, and GNU GPL'd, by Nicholas Nethercote et al.
==4711== Using Valgrind-3.22.0 and LibVEX; rerun with -h for copyright info
==4711== Command: target/release/revme bench snailtracer
==4711== 
Running snailtracer example!
elapsed: 1.133995434s
==4711== 
==4711== I refs:        462,200,776