Exclude process.argv by default

[felixbarny]

It can take quite a lot of space, as it's added to each transaction, and stored even for non-sampled transactions

[codecov-io]

Codecov Report

Merging #118 into master will increase coverage by 0.08%.
The diff coverage is 87.5%.

@@            Coverage Diff             @@
##             master   #118      +/-   ##
==========================================
+ Coverage     76.92%    77%   +0.08%     
- Complexity      953    955       +2     
==========================================
  Files            99     99              
  Lines          3289   3297       +8     
  Branches        290    291       +1     
==========================================
+ Hits           2530   2539       +9     
+ Misses          603    602       -1     
  Partials        156    156

Impacted Files	Coverage Δ	Complexity Δ
...a/co/elastic/apm/report/ReporterConfiguration.java	100% <100%> (ø)	9 <1> (+1)	⬆️
.../java/co/elastic/apm/report/ApmServerReporter.java	54.44% <50%> (-0.11%)	11 <0> (ø)
...a/co/elastic/apm/report/ReportingEventHandler.java	81.81% <0%> (+6.06%)	10% <0%> (+1%)	⬆️

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