Add Client Reports feature

[mattjohnsonpint]

Implement Client Reports. Resolves #1455

Ready for review!

[bruno-garcia]

This is looking great. One concern about value tuples on netfx

[philipphofmann]

This already goes in the right direction. I don't see any issues from a concept point of view right now. Thanks for doing this 🎉. I added a few comments.

[mattjohnsonpint]

Note, I'll need to refactor this to use the transport afterall. Doing it in the background worker will get in the way of the changes I'm getting ready to submit to support extensibility (for Unity WebGL). I have a plan...

[philipphofmann]

Looking better every day 👍

[codecov-commenter]

Codecov Report

Merging #1556 (4cf2dcd) into main (7604242) will decrease coverage by 0.13%.
The diff coverage is 73.46%.

❗ Current head 4cf2dcd differs from pull request most recent head 8cac99e. Consider uploading reports for the commit 8cac99e to get more accurate results

@@            Coverage Diff             @@
##             main    #1556      +/-   ##
==========================================
- Coverage   84.34%   84.21%   -0.14%     
==========================================
  Files         219      224       +5     
  Lines        7423     7520      +97     
  Branches     1417     1427      +10     
==========================================
+ Hits         6261     6333      +72     
- Misses        735      759      +24     
- Partials      427      428       +1     

Impacted Files	Coverage Δ
src/Sentry/Internal/Extensions/JsonExtensions.cs	78.21% <0.00%> (-1.79%)	⬇️
src/Sentry/Internal/ClientReport.cs	31.57% <31.57%> (ø)
src/Sentry/Envelopes/EnvelopeItem.cs	90.20% <61.53%> (-2.87%)	⬇️
src/Sentry/Internal/Enumeration.cs	83.33% <83.33%> (ø)
src/Sentry/Internal/ThreadsafeCounterDictionary.cs	85.71% <85.71%> (ø)
src/Sentry/Envelopes/Envelope.cs	96.87% <100.00%> (+0.10%)	⬆️
src/Sentry/Internal/BackgroundWorker.cs	94.07% <100.00%> (+0.60%)	⬆️
src/Sentry/Internal/DataCategory.cs	100.00% <100.00%> (ø)
src/Sentry/Internal/DiscardReason.cs	100.00% <100.00%> (ø)
src/Sentry/SentryOptions.cs	90.36% <100.00%> (+0.05%)	⬆️
... and 1 more

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