[Merged by Bors] - hare3: switch to sync validation for gossip messages

[dshulyak]

currently every validation request spawns new goroutine, the main reason for that was
to enable fetching over network without blocking other threads.

however hare3 will be spawning many goroutines and it will be much more efficient to execute protocol inline.
the same is true for beacon.

[dshulyak]

bors try

[bors]

try

Build failed:

• ci-status

[dshulyak]

bors try

[codecov]

Codecov Report

Merging #4937 (71a8e79) into develop (5d25947) will decrease coverage by 0.1%.
The diff coverage is 55.0%.

❗ Current head 71a8e79 differs from pull request most recent head 3d62477. Consider uploading reports for the commit 3d62477 to get more accurate results

@@            Coverage Diff            @@
##           develop   #4937     +/-   ##
=========================================
- Coverage     77.1%   77.1%   -0.1%     
=========================================
  Files          263     263             
  Lines        30532   30542     +10     
=========================================
- Hits         23558   23552      -6     
- Misses        5486    5501     +15     
- Partials      1488    1489      +1     

Files Changed	Coverage Δ
p2p/pubsub/pubsub.go	84.3% <ø> (ø)
p2p/pubsub/mocks/publisher.go	69.6% <50.0%> (-4.3%)	⬇️
hare3/hare.go	84.5% <100.0%> (ø)
p2p/pubsub/wrapper.go	65.9% <100.0%> (ø)

... and 12 files with indirect coverage changes

[bors]

try

Build succeeded!

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• ci-status

[dshulyak]

bors merge

[bors]

Pull request successfully merged into develop.

Build succeeded!

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