Added synced net messenger

[iulianpascalau]

Reasoning behind the pull request

• added syncedNetworkMessenger

Proposed changes

Testing procedure

Pre-requisites

Based on the Contributing Guidelines the PR author and the reviewers must check the following requirements are met:

• was the PR targeted to the correct branch?
• if this is a larger feature that probably needs more than one PR, is there a feat branch created?
• if this is a feat branch merging, do all satellite projects have a proper tag inside go.mod?

[codecov]

Codecov Report

Patch coverage: 83.41% and no project coverage change.

Comparison is base (9768b16) 79.96% compared to head (6bcd6d0) 79.97%.
Report is 1 commits behind head on feat/test-only-processor-node.

❗ Current head 6bcd6d0 differs from pull request most recent head 77b84b8. Consider uploading reports for the commit 77b84b8 to get more accurate results

Additional details and impacted files

@@                       Coverage Diff                       @@
##           feat/test-only-processor-node    #5575    +/-   ##
===============================================================
  Coverage                          79.96%   79.97%            
===============================================================
  Files                                716      718     +2     
  Lines                              94122    94333   +211     
===============================================================
+ Hits                               75267    75440   +173     
- Misses                             13470    13500    +30     
- Partials                            5385     5393     +8     

Files Changed	Coverage Δ
node/processingOnlyNode/syncedMessenger.go	83.00% <83.00%> (ø)
node/processingOnlyNode/syncedBroadcastNetwork.go	84.48% <84.48%> (ø)

... and 3 files with indirect coverage changes

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