fix: Remove stacktrace from event

[bruno-garcia]

Stacktrace belongs to a Thread or an Exception.

Resolves #18

[codecov-io]

Codecov Report

Merging #38 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #38      +/-   ##
=========================================
- Coverage   94.93%   94.9%   -0.04%     
=========================================
  Files          25      25              
  Lines         652     471     -181     
=========================================
- Hits          619     447     -172     
+ Misses         33      24       -9

Impacted Files	Coverage Δ
src/Sentry.Protocol/SentryEvent.cs	100% <ø> (ø)	⬆️
src/Sentry.Protocol/Context/Contexts.cs	89.28% <0%> (-10.72%)	⬇️
src/Sentry.Protocol/CollectionsExtensions.cs	90% <0%> (-10%)	⬇️
src/Sentry.Protocol/Dsn.cs	94.11% <0%> (-5.89%)	⬇️
src/Sentry.Protocol/User.cs	95.65% <0%> (-4.35%)	⬇️
src/Sentry.Protocol/Request.cs	96.66% <0%> (-3.34%)	⬇️
src/Sentry.Protocol/BaseScopeExtensions.cs	83.33% <0%> (+3.09%)	⬆️

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