Don't expose internals

[bruno-garcia]

• Works around iOS issue: Strong name and InternalsVisibleTo crash on device (works on emulator) xamarin/xamarin-macios#4895

[codecov-io]

Codecov Report

Merging #17 into master will decrease coverage by 3.97%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
- Coverage   98.14%   94.17%   -3.98%     
==========================================
  Files          22       24       +2     
  Lines         432      584     +152     
==========================================
+ Hits          424      550     +126     
- Misses          8       34      +26

Impacted Files	Coverage Δ
src/Sentry.Protocol/SentryEventExtensions.cs	0% <0%> (ø)
src/Sentry.Protocol/SentryEvent.cs	100% <100%> (ø)	⬆️
src/Sentry.Protocol/BaseScopeExtensions.cs	78.14% <78.14%> (ø)
src/Sentry.Protocol/BaseScope.cs	100% <0%> (+9.09%)	⬆️
src/Sentry.Protocol/CollectionsExtensions.cs	100% <0%> (+30%)	⬆️

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