refactor(core-p2p): refactor codecs so buffer isn't re-allocated 400 times.

[rainydio]

Summary

That buffers.reduce allocated new buffer on each iteration.

Checklist

• Ready to be merged

[codecov-commenter]

Codecov Report

Merging #4493 (0cbaa4a) into develop (51539e1) will decrease coverage by 0.01%.
The diff coverage is 36.00%.

@@             Coverage Diff             @@
##           develop    #4493      +/-   ##
===========================================
- Coverage    95.59%   95.57%   -0.02%     
===========================================
  Files          687      687              
  Lines        17487    17492       +5     
  Branches      2140     2141       +1     
===========================================
+ Hits         16716    16718       +2     
- Misses         565      568       +3     
  Partials       206      206              

Flag	Coverage Δ
functional	6.01% <0.00%> (-0.01%)	⬇️
integration	10.00% <0.00%> (-0.01%)	⬇️
unit	94.10% <36.00%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
...ckages/core-p2p/src/socket-server/codecs/blocks.ts	12.76% <0.00%> (-0.57%)	⬇️
.../core-p2p/src/socket-server/codecs/transactions.ts	82.60% <75.00%> (-2.40%)	⬇️

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