perf(state-sync): download parts unordered to avoid head-of-line blocking

[Trisfald]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (2.13-release@5af9ca7). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
chain/client/src/sync/state/shard.rs	92.85%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##             2.13-release   #16176   +/-   ##
===============================================
  Coverage                ?   69.83%           
===============================================
  Files                   ?      950           
  Lines                   ?   205349           
  Branches                ?   205349           
===============================================
  Hits                    ?   143410           
  Misses                  ?    57158           
  Partials                ?     4781           

Flag	Coverage Δ
pytests-nightly	1.10% <0.00%> (?)
unittests	69.59% <92.85%> (?)
unittests-nightly	69.58% <92.85%> (?)

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