Make sync great again

[osmirnov]

I've checked the sync by myself after the team worked on it. I've got it work but slow.

This is the result of running 1 hour debug session in VS. After I shuted down that experiment. Specs: Time elapsed: ~1 hour Blocks/Headers Synced: >200,000 Peers to sync: 4 initially, after 40 mins 1 disconnected

Observations

• The speed is low. We need 24 hours to sync entirely all blocks on the network.
• I did not notice any parallel access to resources problems.
• StartNew works as expected and did not fail for me
• BlockPool did not go over capacity

[codecov[bot]]

Codecov Report

Merging #490 into development will decrease coverage by 0.21%. The diff coverage is 6.25%.

@@               Coverage Diff               @@
##           development     #490      +/-   ##
===============================================
- Coverage        52.94%   52.72%   -0.22%     
===============================================
  Files              304      304              
  Lines            12760    12811      +51     
===============================================
- Hits              6756     6755       -1     
- Misses            6004     6056      +52

Impacted Files	Coverage Δ
...Sharp.Persistence.RedisDB/RedisDbJsonRepository.cs	69.93% <0%> (-1.88%)	:arrow_down:
src/NeoSharp.Core/Network/PeerMessageListener.cs	0% <0%> (ø)	:arrow_up:
...rp.Core/Blockchain/Repositories/BlockRepository.cs	0% <0%> (ø)	:arrow_up:
.../NeoSharp.Persistence.RocksDB/RocksDbRepository.cs	87.03% <0%> (-2.21%)	:arrow_down:
...arp.Persistence.RedisDB/RedisDbBinaryRepository.cs	85.52% <0%> (-2.32%)	:arrow_down:
...e/Messaging/Handlers/BlockHeadersMessageHandler.cs	0% <0%> (ø)	:arrow_up:
...Sharp.Core/Blockchain/Processing/BlockProcessor.cs	100% <100%> (ø)	:arrow_up:

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