avoid using recv in sigverify

[KirillLykov]

Problem

The current version uses recv_timeout which internally relies on the parking/waiking up mechanism.

This PR is draft because it should land after #9732

Summary of Changes

We use looping with only try_recv instead to reduce synchronization overhead. See profiler output:

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.7%. Comparing base (f35824c) to head (9acfd12).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9727   +/-   ##
=======================================
  Coverage    82.7%    82.7%           
=======================================
  Files         854      854           
  Lines      320932   320941    +9     
=======================================
+ Hits       265512   265530   +18     
+ Misses      55420    55411    -9     

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