Echancement: BLS signatures are gathered more asynchronously

[sergiy-skalelabs]

• BLS signatures are gathered more asynchronously
• Prevents BLS signature gathering from being stuck on N-th stopped node
• Speeds up BLS signature gathering
• Human-readable BLS gathering progress is logged

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (024521c) 85.79% compared to head (e435f1c) 85.79%.

❗ Current head e435f1c differs from pull request most recent head 952815b. Consider uploading reports for the commit 952815b to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1594   +/-   ##
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  Coverage    85.79%   85.79%           
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  Files           26       26           
  Lines         1464     1464           
  Branches       401      401           
========================================
  Hits          1256     1256           
  Misses          33       33           
  Partials       175      175           

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