refactor(p2p): pack protobuf validator bitmaps

[oXtxNt9U]

Summary

• the header bitmaps (every request and response) and the getMessages bitmaps are now one count byte plus the validatorSetPack bigint instead of one byte per validator
• packing and unpacking happens transparently at the codec level, everything else is untouched

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

❌ Patch coverage is 45.16129% with 68 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.32%. Comparing base (8e735c3) to head (809bcb2).

Files with missing lines	Patch %	Lines
...es/p2p/source/socket-server/codecs/proto/protos.js	39.13%	56 Missing ⚠️
...s/p2p/source/socket-server/codecs/get-api-nodes.ts	0.00%	2 Missing ⚠️
...ages/p2p/source/socket-server/codecs/get-blocks.ts	0.00%	2 Missing ⚠️
...kages/p2p/source/socket-server/codecs/get-peers.ts	0.00%	2 Missing ⚠️
...es/p2p/source/socket-server/codecs/get-proposal.ts	0.00%	2 Missing ⚠️
...es/p2p/source/socket-server/codecs/get-messages.ts	66.66%	1 Missing ⚠️
...ackages/p2p/source/socket-server/codecs/headers.ts	94.11%	1 Missing ⚠️
...es/p2p/source/socket-server/codecs/post-message.ts	0.00%	1 Missing ⚠️
...s/p2p/source/socket-server/codecs/post-proposal.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                       Coverage Diff                       @@
##           feat/p2p/get-proposal-round    #1447      +/-   ##
===============================================================
+ Coverage                        77.18%   80.32%   +3.13%     
===============================================================
  Files                              963      964       +1     
  Lines                            17141    17110      -31     
  Branches                          2462     2475      +13     
===============================================================
+ Hits                             13231    13744     +513     
+ Misses                            3903     3359     -544     
  Partials                             7        7              

Flag	Coverage Δ
contracts	91.76% <ø> (ø)
packages	80.02% <45.16%> (+3.21%)	⬆️

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

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.