Providing the ability to output to a file instead of the default output to NATS

[devhindo]

fixes: #355

[codecov]

Codecov Report

Attention: Patch coverage is 4.08163% with 47 lines in your changes missing coverage. Please review.

Project coverage is 5.51%. Comparing base (1b87068) to head (0aec3cf).
Report is 13 commits behind head on master.

Files with missing lines	Patch %	Lines
meshsync/handlers.go	0.00%	43 Missing ⚠️
main.go	0.00%	3 Missing ⚠️
internal/config/config.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #364      +/-   ##
=========================================
+ Coverage    5.50%   5.51%   +0.01%     
=========================================
  Files          24      24              
  Lines        1108    1142      +34     
=========================================
+ Hits           61      63       +2     
- Misses       1040    1072      +32     
  Partials        7       7              

Flag	Coverage Δ
unittests	5.51% <4.08%> (+0.01%)	⬆️

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