feat(symbolication): upload dart symbol mapping file

[buenaflor]

Blocked by getsentry/sentry-cli#2691
Blocked by #327

📜 Description

Adds support for uploading dart symbol maps

💡 Motivation and Context

Part of getsentry/sentry-dart#2805

💚 How did you test it?

Unit, integration, manual

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

[github-actions]

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

Generated by 🚫 dangerJS against 08b9690

[denrase]

Neat, just glanced over and gave general feedback. Please also make sure we have all possible cases in _prependDebugIdMarkerToMapFile covered:

• file without marker
• file with other marker
• file with same marker

TODOs should also either be resolved or issues created for them, otherwise they might linger around forever and the next one might not have enough context to resolve them.