feat: Improved samples

[bitsandfoxes]

Transition scene got repurposed into "Additional Samples".

• Adding a screenshot as attachment to a message Add AttachScreenshot option #284
• Sending message with modified context
• Force Crash Add ForceCrash to sample #252

[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

- Improved samples ([#472](https://github.com/getsentry/sentry-unity/pull/472))

If none of the above apply, you can opt out of this check by adding #skip-changelog to the PR description.

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