expose httpHandler creation

[bruno-garcia]

Resolves #359

[codecov-io]

Codecov Report

Merging #359 into master will increase coverage by 0.08%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #359      +/-   ##
==========================================
+ Coverage   92.16%   92.24%   +0.08%     
==========================================
  Files          82       82              
  Lines        2120     2129       +9     
==========================================
+ Hits         1954     1964      +10     
+ Misses        166      165       -1

Impacted Files	Coverage Δ
src/Sentry/Internal/SdkComposer.cs	95% <ø> (ø)	⬆️
...ry/Internal/Http/DefaultSentryHttpClientFactory.cs	92.1% <100%> (+2.63%)	⬆️
src/Sentry/SentryOptions.cs	97.91% <100%> (+0.02%)	⬆️
src/Sentry.NLog/SentryTarget.cs	95.7% <0%> (+0.22%)	⬆️

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