fix: Custom Gunicorn logger not sending StatsD stats

[khvn26]

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Changes

This enables StatsD support for our own GunicornJsonCapableLogger.

How did you test this code?

Will test manually with @rolodato's StatsD debug setup.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		Nov 7, 2024 0:56am
flagsmith-frontend-preview	⬜️ Ignored (Inspect)	Visit Preview		Nov 7, 2024 0:56am
flagsmith-frontend-staging	⬜️ Ignored (Inspect)	Visit Preview		Nov 7, 2024 0:56am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-4819	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-4819	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4819	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4819	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4819	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4819	Finished ✅	Results ✅

[github-actions]

Uffizzi Ephemeral Environment deployment-58057

☁️ https://app.uffizzi.com/github.com/Flagsmith/flagsmith/pull/4819

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[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 97.32%. Comparing base (e6f1bac) to head (8157bba).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
api/util/logging.py	20.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4819      +/-   ##
==========================================
- Coverage   97.33%   97.32%   -0.01%     
==========================================
  Files        1180     1180              
  Lines       41223    41225       +2     
==========================================
+ Hits        40123    40124       +1     
- Misses       1100     1101       +1     

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