feat: enable debug mode by default

Description

To improve troubleshooting possibilities and increase DLE server transparency, enable debug mode by default

Related issue

Internal thread: https://postgres-ai.slack.com/archives/CSXS2JV6W/p1673288909848109

Examples

Checklist

• MR description has been reviewed
• MR changes are functionally tested
• MR does NOT have API/CLI changes OR there are API/CLI changes and they have been reviewed & DOCS ARE ADJUSTED (reference doc, etc)
• MR does NOT have UI changes OR there are UI changes and they have been reviewed & UX IS REVIEWED