Make setSentryUnhandledExceptionHook public

[buenaflor]

📜 Description

Makes the setSentryUnhandledExceptionHook api public so users can initialize the iOS SDK themselves and drop the unhandled exceptions created automatically that doesn't have useful information. See here

💡 Motivation and Context

Closes #200

💚 How did you test it?

X

📝 Checklist

You have to check all boxes before merging:

• 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.

🔮 Next steps

[krystofwoldrich]

LGTM 🚀