fix(models/featureevaluationraw): Add index on crated_at

[gagantrivedi]

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Changes

Create index on featureevaluationraw to reduce query time
fixes #4403

How did you test this code?

Before index:

 Planning Time: 0.155 ms
 Execution Time: 18726.876 ms

After index:

 Planning Time: 0.203 ms
 Execution Time: 6.413 ms

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		Jul 29, 2024 10:32am
flagsmith-frontend-preview	⬜️ Ignored (Inspect)	Visit Preview		Jul 29, 2024 10:32am
flagsmith-frontend-staging	⬜️ Ignored (Inspect)	Visit Preview		Jul 29, 2024 10:32am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-4405	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-4405	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4405	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4405	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4405	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4405	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-54734 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.84%. Comparing base (3f745c5) to head (8f43017).
Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4405   +/-   ##
=======================================
  Coverage   96.83%   96.84%           
=======================================
  Files        1165     1167    +2     
  Lines       38621    38683   +62     
=======================================
+ Hits        37398    37461   +63     
+ Misses       1223     1222    -1     

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