feat(symbolication): fetch debug files relevant for symbolicating obfuscated Dart stacktraces

[buenaflor]

📜 Description

Note: this will be merged into the branch umbrella/dart-symbol-map since this will be split up into multiple PRs

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This is a step towards symbolicating Flutter issue titles and PR #1 out of 2

• First we fetch all the paths to the debug files that are relevant for symbolicating Dart stacktraces in obfuscated Flutter builds (.symbols and mach-o files)
• (In follow up PR): fetch the generated mapping file and upload it with

sentry-cli dart-symbol-map upload --org my-org --project my-proj /path/to/mapping /path/to/debug-file

💡 Motivation and Context

Part of getsentry/sentry-dart#2805

💚 How did you test it?

📝 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

#skip-changelog

[github-actions]

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

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[buenaflor]

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