feat: sync pools added to core for memory optimisations

[Pratham-Mishra04]

Summary

Refactored the Cohere provider implementation to simplify message content handling and improve code maintainability.

Changes

• Simplified the Cohere message content handling by directly using the CohereMessageContent struct instead of helper methods
• Removed unnecessary helper methods (NewStringContent, NewBlocksContent, IsString, IsBlocks, GetString, GetBlocks)
• Updated all references to use direct struct field access instead of the removed helper methods
• Fixed the order of method declarations in OpenAI types.go to improve code organization

Type of change

• Bug fix
• Feature
• Refactor
• Documentation
• Chore/CI

Affected areas

• Core (Go)
• Transports (HTTP)
• Providers/Integrations
• Plugins
• UI (Next.js)
• Docs

How to test

# Core/Transports
go version
go test ./...

Verify that Cohere API requests and responses are properly handled with both string content and block content.

Breaking changes

• No

Checklist

• I added/updated tests where appropriate
• I verified builds succeed (Go and UI)

[Pratham-Mishra04]

• feat: add ResponsesMessage support to logging #573
• feat: sync pools added to core for memory optimisations #572 👈 (View in Graphite)
• main

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch 10-07-feat_sync_pools_added_to_all_internal_structs

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