Hubs/Scopes Merge 20 - Use separate scope for current, isolation and global scope

[adinauer]

#skip-changelog

📜 Description

• Use separate scope for current, isolation and global scope
• Rename mainScopes to rootScopes
• Rename cloneMainHub to forkedRootScopes

TODO: We need to figure out how to deal with global scope. It should already be available before Sentry.init is called but Scope requires SentryOptions e.g. to set some limits. At the moment we're replacing global scope on init but that should be changed in a follow up PR.

💡 Motivation and Context

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code.
• 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.
• 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

[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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