feat: backend-clone-segments

[Zaimwa9]

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• I have added information to docs/ if required so people know about the feature!
• I have filled in the "Changes" section below?
• I have filled in the "How did you test this code" section below?
• I have used a Conventional Commit title for this Pull Request

Changes

This PR implements the backend cloning/duplication of segments

• New CloneSegmentSerializer, requiring a name and performing the duplication
• New endpoint /api/v1/projects/{projectId}/segments/{segmentId}/clone/ accepting a (required) name as body payload
• Metadata new method deep_clone_for_new_entity, taking an entity (segment/env/feature) to deep clone and create the related new metadata

How did you test this code?

• New tests
• Postman requests
• Fullstack branch feat/clone-segments-and-feature-segments

Project Segment creation
https://www.loom.com/share/27ec8d4a2d8d4c24b443ac5d2b12231e?focus_title=1&muted=1&from_recorder=1

Feature specific segment creation
https://www.loom.com/share/8cc4d8e92ce84c459dfb6598ebb42acb

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[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-5393	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-5393	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-5393	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-5393	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5393	Finished ✅	Results ✅

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.66%. Comparing base (a0e7c5b) to head (a345e36).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #5393    +/-   ##
========================================
  Coverage   97.65%   97.66%            
========================================
  Files        1235     1237     +2     
  Lines       43334    43473   +139     
========================================
+ Hits        42317    42456   +139     
  Misses       1017     1017            

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[emyller]

Looking great. A few minor adjustments needed — sorry we didn't have time while pairing today, but we're close!

[emyller]

LGTM