Ipfix plugin: Add Lz4 compression

[BonnyAD9]

No description provided.

[cejkato2]

It would be perfect to have a switch in configure to be able to disable this feature during the build.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 19.87578% with 129 lines in your changes missing coverage. Please review.

Project coverage is 40.53%. Comparing base (5ba318c) to head (a72a1b8).
Report is 7 commits behind head on master.

Files	Patch %	Lines
output/ipfix.cpp	19.35%	119 Missing and 6 partials ⚠️
output/ipfix.hpp	33.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #179      +/-   ##
==========================================
- Coverage   40.80%   40.53%   -0.28%     
==========================================
  Files         104      104              
  Lines        9956    10102     +146     
  Branches     1467     1493      +26     
==========================================
+ Hits         4063     4095      +32     
- Misses       5033     5143     +110     
- Partials      860      864       +4     

Flag	Coverage Δ
tests	40.53% <19.87%> (-0.28%)	⬇️

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