fix/valgrind-async-disaptch-threadpool-failure

[noahehall]

• simplify the code to its most basic form and build up from there; adding useMalloc didnt resolve the issue

  • start with a file that just includes asyncdispatch & threadpool
  • incrementally add the existing logic to see why exactly this throws
    • its weird because the only thing we're doing is importing asyncdispatch and threadpool

• if you run tconfig via nim c instead of testament all you get a bunch of warnings

/home/runner/work/nightlies/nightlies/nim-1.6.12/compiler/sempass2.nim(209, 10) 
compiler msg initiated here [MsgOrigin]

/home/poop/git/private/nirv/boat/tests/config/tconfig.nim(21, 32)
Warning: not GC-safe: 'proc (): auto = result = save(newConf(newConfig(), defaultManifest), "")' 
[GcUnsafe]
    it should, "save config", () => newConf().save()