feat(consensus): allow a streamed proposal channel on top of existing

[guy-starkware]

This is part of a series of PRs to integrate streaming of consensus proposals.
It adds the streaming channels but does not connect them to block building or validation, yet.

[reviewable-StarkWare]

This change is 

[github-actions]

Benchmark movements:
tree_computation_flow performance regressed!
tree_computation_flow time: [34.024 ms 34.482 ms 35.018 ms]
change: [+1.1167% +2.4665% +4.0611%] (p = 0.00 < 0.05)
Performance has regressed.
Found 11 outliers among 100 measurements (11.00%)
11 (11.00%) high severe

[github-actions]

Artifacts upload workflows:

• Started at 2024-11-25T12:32:36Z
• Started at 2024-11-25T12:36:41Z
• Started at 2024-11-25T14:34:12Z
• Started at 2024-11-25T15:23:24Z
• Started at 2024-11-26T08:50:02Z

[codecov]

Codecov Report

Attention: Patch coverage is 61.07784% with 65 lines in your changes missing coverage. Please review.

Project coverage is 77.01%. Comparing base (e3165c4) to head (e7feca7).
Report is 576 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/papyrus_protobuf/src/consensus.rs	32.65%	32 Missing and 1 partial ⚠️
crates/starknet_api/src/transaction.rs	39.13%	14 Missing ⚠️
crates/papyrus_node/src/run.rs	0.00%	13 Missing ⚠️
...sequencing/papyrus_consensus/src/stream_handler.rs	93.75%	0 Missing and 2 partials ⚠️
...nsus_orchestrator/src/papyrus_consensus_context.rs	86.66%	2 Missing ⚠️
...rates/papyrus_protobuf/src/converters/consensus.rs	88.88%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2262       +/-   ##
===========================================
+ Coverage   40.10%   77.01%   +36.90%     
===========================================
  Files          26      386      +360     
  Lines        1895    40548    +38653     
  Branches     1895    40548    +38653     
===========================================
+ Hits          760    31228    +30468     
- Misses       1100     7022     +5922     
- Partials       35     2298     +2263     

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