Resolve the conflict around debug mode flag after pull merge

[kinance]

Background

To resolve the conflict around the debug mode flag after pull merge. cfg.debug and cfg.debug_mode was checked in by different pull requests. They conflicted.

Changes

The change is to keep cfg.debug_mode because it's consistent with other modes, so 1. revised the parts using cfg.debug to use cfg.debug_mode, and 2. kept the parts using cfg.debug_mode.

Documentation

Part of the codes already have comments. It's a simple commit to resolve conflicts.

Test Plan

Tested with running with --debug in command line.

PR Quality Checklist

• [*] My pull request is atomic and focuses on a single change.
• [*] I have thouroughly tested my changes with multiple different prompts.
• [*] I have considered potential risks and mitigations for my changes.
• [*] I have documented my changes clearly and comprehensively.
• [*] I have not snuck in any "extra" small tweaks changes

[kinance]

@nponeccop @Torantulino Please help review to resolve conflicts around debug mode, #457