Move cold app start detection and activity timespan generation back t…

[markushi]

📜 Description

Still a draft, but moves the duty of collecting Activity Spans and setting the app start type back to the ContentProvider. This allows us to collect performance data, even if the SDK itself is initialized async. E.g. for React Native where the first Activity.onCreate() happens before SentryAndroid.init().

💡 Motivation and Context

Fixes getsentry/sentry-react-native#4598

💚 How did you test it?

📝 Checklist

• 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

…o SentryPerformanceProvider

[github-actions]

	Fails
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## Unreleased

- Move cold app start detection and activity timespan generation back t… ([#4214](https://github.com/getsentry/sentry-java/pull/4214))

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Generated by 🚫 dangerJS against 2e0425e

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	399.61 ms	442.00 ms	42.39 ms
Size	1.70 MiB	2.36 MiB	672.36 KiB