Synchronized Broadcasting Block

[xxo1shine]

What does this PR do?
Synchronized broadcasting block, increase block broadcasting speed

Why are these changes required?
Reducing block loss rate, increasing network stability

This PR has been tested by:

• Unit Tests
• Manual Testing

Follow up

Extra details

[codecov-io]

Codecov Report

Merging #2144 into develop will increase coverage by 0.09%.
The diff coverage is 25%.

@@              Coverage Diff              @@
##             develop    #2144      +/-   ##
=============================================
+ Coverage       41.9%   41.99%   +0.09%     
- Complexity      4322     4334      +12     
=============================================
  Files            544      544              
  Lines          32968    32973       +5     
  Branches        3591     3594       +3     
=============================================
+ Hits           13814    13847      +33     
+ Misses         17836    17801      -35     
- Partials        1318     1325       +7

Impacted Files	Coverage Δ	Complexity Δ
...n/core/net/messagehandler/InventoryMsgHandler.java	36.66% <ø> (+0.3%)	5 <0> (ø)	⬇️
...g/tron/common/overlay/discover/DiscoverServer.java	82.75% <0%> (+3.09%)	8 <0> (+1)	⬆️
...ain/java/org/tron/core/net/service/AdvService.java	19.16% <27.77%> (-10.59%)	10 <2> (-4)
...n/java/org/tron/core/net/message/BlockMessage.java	41.17% <0%> (-5.89%)	3% <0%> (-1%)
src/main/java/org/tron/core/db/Manager.java	42.55% <0%> (+0.17%)	122% <0%> (+1%)	⬆️
.../java/org/tron/common/overlay/server/SyncPool.java	33.84% <0%> (+0.76%)	13% <0%> (+1%)	⬆️
...overlay/discover/node/statistics/MessageCount.java	55.55% <0%> (+2.77%)	7% <0%> (+1%)	⬆️
...erlay/discover/node/statistics/NodeStatistics.java	43.37% <0%> (+4.81%)	7% <0%> (+3%)	⬆️
... and 5 more

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[jiangyy0824]

ok