feat(code): Use broadcast with persistent substreams

[bastienfaivre]

Closes: #XXX

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PR author checklist

For all contributors

• Reference a GitHub issue
• Ensure the PR title follows the conventional commits spec
• Add a release note in RELEASE_NOTES.md if the change warrants it
• Add an entry in BREAKING_CHANGES.md if the change warrants it

For external contributors

• Maintainers of Malachite are allowed to push changes to the branch

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.62%. Comparing base (1003508) to head (7d6b10a).

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1117      +/-   ##
==========================================
- Coverage   75.63%   75.62%   -0.01%     
==========================================
  Files         170      170              
  Lines       17963    17963              
  Branches    17963    17963              
==========================================
- Hits        13585    13583       -2     
  Misses       3498     3498              
- Partials      880      882       +2     

Flag	Coverage Δ
integration	75.42% <ø> (-0.04%)	⬇️
mbt	7.77% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
core	82.49% <ø> (+0.02%)	⬆️
engine	72.07% <ø> (-0.03%)	⬇️
app	87.08% <ø> (+0.18%)	⬆️
starknet	73.56% <ø> (+0.07%)	⬆️