feat: script for setting kernel tunables and check when running neard

[stedfn]

Standalone script for setting the recommended networking settings on Linux and addition of a check when starting neard. If the settings are not right, errors will be printed without halting the process.

[codecov]

Codecov Report

Attention: Patch coverage is 5.71429% with 33 lines in your changes missing coverage. Please review.

Project coverage is 70.20%. Comparing base (3270551) to head (1c08c53).
Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
neard/src/cli.rs	5.71%	33 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12577      +/-   ##
==========================================
+ Coverage   70.02%   70.20%   +0.17%     
==========================================
  Files         840      840              
  Lines      169854   170141     +287     
  Branches   169854   170141     +287     
==========================================
+ Hits       118947   119445     +498     
+ Misses      45871    45630     -241     
- Partials     5036     5066      +30     

Flag	Coverage Δ
backward-compatibility	0.16% <0.00%> (-0.01%)	⬇️
db-migration	0.16% <0.00%> (?)
genesis-check	1.29% <0.00%> (?)
linux	69.42% <5.71%> (+0.10%)	⬆️
linux-nightly	69.79% <5.71%> (+0.01%)	⬆️
pytests	1.60% <0.00%> (+1.43%)	⬆️
sanity-checks	1.41% <0.00%> (?)
unittests	70.03% <5.71%> (+<0.01%)	⬆️
upgradability	0.20% <0.00%> (?)

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[VanBarbascu]

Cool stuff!