Add documentation about intercepting logs

[nuno-vieira]

🔗 Issue Links

None

🎯 Goal

Adds documentation about how customers can intercept logs with the current logger implementation.

🧪 Manual Testing Notes

N/A

☑️ Contributor Checklist

• I have signed the Stream CLA (required)
• This change follows zero ⚠️ policy (required)
• This change should be manually QAed
• Changelog is updated with client-facing changes
• New code is covered by unit tests
• Comparison screenshots added for visual changes
• Affected documentation updated (docusaurus, tutorial, CMS)