[DNM] Add Scan Tool to debug#830

Draft

Besroy wants to merge 4 commits intoeBay:masterfrom

Besroy:meta_gcc

Commits on Nov 19, 2025

Add Scan Tool on Meta:
yawzhang
committed

Commits on Nov 20, 2025

fix format issue && add py script to print pg/shard id
yawzhang
committed

Commits on Nov 26, 2025

optimize read logic for sepcial debug chunk
yawzhang
committed

Commits on Dec 2, 2025

print blk position to avoid dup blk definition in different position
yawzhang
committed