Add admin stats find route

[tudddorrr]

New admin endpoint for game stats

• Added a new GET /admin/v1/game-stats/:id endpoint to retrieve a single game stat by ID
• Requires READ_STATS scope on the admin API key

Metrics and global stat handling

• Endpoint supports optional metrics loading via withMetrics query parameter for global stats, with optional date range filtering
• For global stats, automatically recalculates the global value excluding dev data unless the x-talo-include-dev-data header is set

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.33%. Comparing base (3e5a1fb) to head (338b2d9).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1020      +/-   ##
===========================================
- Coverage    98.34%   98.33%   -0.02%     
===========================================
  Files          442      443       +1     
  Lines         7261     7274      +13     
  Branches       973      976       +3     
===========================================
+ Hits          7141     7153      +12     
  Misses          49       49              
- Partials        71       72       +1     

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