feat: Sync file attachments to native

[bitsandfoxes]

📜 Description

Relies on getsentry/sentry-native#1584

Attachments added to the scope should get synced to sentry-native. I.e. a Unity games has

SentrySdk.ConfigureScope(scope => scope.AddAttachment("special-logfile.log");

and the game crashes, that attachment should be available in the resulting sentry event.

💡 Motivation and Context

Resolves #4758

💚 How did you test it?

Unit tests. Unity SDK will have e2e tests.

📝 Checklist

• I added GH Issue ID & Linear ID
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

This needs to be used and implemented in the hybrid SDKs.
Adding support to sync bytes as attachments.

[github-actions]

Semver Impact of This PR

🟡 Minor (new features)

📋 Changelog Preview

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New Features ✨

• Sync file attachments to native by bitsandfoxes in #5211

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_{🤖 This preview updates automatically when you update the PR.}

[github-actions]

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

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