Normalize column names in governance crawler

[mars-lan]

🤔 Why?

We're now normalizing column names to lower cases across the board.

🤓 What?

As titled.

🧪 Tested?

Verified end-to-end:

☑️ Checks

• My PR contains actual code changes, and I have updated the version number in pyproject.toml.

[github-actions]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
19850	18603	94%	85%	🟢

New Files

No new covered files...

Modified Files

File	Coverage	Status
metaphor/custom/governance/config.py	95%	🟢
TOTAL	95%	🟢

updated for commit: 0c8d6d1 by action🐍

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.71%. Comparing base (a17afd9) to head (0c8d6d1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #929      +/-   ##
==========================================
+ Coverage   93.54%   93.71%   +0.17%     
==========================================
  Files         229      182      -47     
  Lines       20033    19850     -183     
==========================================
- Hits        18739    18603     -136     
+ Misses       1294     1247      -47     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.