feat: add script to generate steady stream large chunk state witnesses

[pugachAG]

Loctus was alos considered, but it implementing it as a raw python script appeared much easier.
Part of #11656.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.77%. Comparing base (f2b1280) to head (5605054).
Report is 15 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11771      +/-   ##
==========================================
- Coverage   71.82%   71.77%   -0.05%     
==========================================
  Files         792      796       +4     
  Lines      162765   162924     +159     
  Branches   162765   162924     +159     
==========================================
+ Hits       116899   116939      +40     
- Misses      40816    40935     +119     
  Partials     5050     5050              

Flag	Coverage Δ
backward-compatibility	0.23% <ø> (+<0.01%)	⬆️
db-migration	0.23% <ø> (+<0.01%)	⬆️
genesis-check	1.35% <ø> (+<0.01%)	⬆️
integration-tests	37.92% <ø> (-0.03%)	⬇️
linux	71.28% <ø> (-0.07%)	⬇️
linux-nightly	71.34% <ø> (-0.07%)	⬇️
macos	54.54% <ø> (-0.04%)	⬇️
pytests	1.58% <ø> (+<0.01%)	⬆️
sanity-checks	1.38% <ø> (+<0.01%)	⬆️
unittests	66.21% <ø> (-0.05%)	⬇️
upgradability	0.28% <ø> (+<0.01%)	⬆️

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