Proper sdk name reporting for sentry event; test

[semuserable]

• check version numbers and naming for package too. I guess the version should be different
• removed nullability for SentryEvent and Sdk based on dotnet Sentry SDK, it's still on ISentryEventProcessor, but from usage perspective it's not nullable

closes #96

[semuserable]

@bruno-garcia ok, question for this danger thing. I need to add the exact wording from commit message into CHANGELOG.md? Otherwise an error? I added it already to Unreleased part (- Proper sdk name reporting for sentry event (#96)), but it fails.

[bruno-garcia]

The comment posted on the PR has some instructions if you click onit:

The problem is that the PR number is #111 not #96

[semuserable]

@bruno-garcia thanks! All comments applied.