Refactor model cache breakpoint logic to use model info in Unbound

[pugazhendhi-m]

Related GitHub Issue

Closes: #4137

Description

This PR improves how we handle cache breakpoints for different models by using the supportsPromptCache flag from model info to determine if cache breakpoints should be added.

Test Procedure

Type of Change

• 🐛 Bug Fix: Non-breaking change that fixes an issue.
• ✨ New Feature: Non-breaking change that adds functionality.
• 💥 Breaking Change: Fix or feature that would cause existing functionality to not work as expected.
• ♻️ Refactor: Code change that neither fixes a bug nor adds a feature.
• 💅 Style: Changes that do not affect the meaning of the code (white-space, formatting, etc.).
• 📚 Documentation: Updates to documentation files.
• ⚙️ Build/CI: Changes to the build process or CI configuration.
• 🧹 Chore: Other changes that don't modify src or test files.

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Code Quality:
  • My code adheres to the project's style guidelines.
  • There are no new linting errors or warnings (npm run lint).
  • All debug code (e.g., console.log) has been removed.
• Testing:
  • New and/or updated tests have been added to cover my changes.
  • All tests pass locally (npm test).
  • The application builds successfully with my changes.
• Branch Hygiene: My branch is up-to-date (rebased) with the main branch.
• Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
• Changeset: A changeset has been created using npm run changeset if this PR includes user-facing changes or dependency updates.
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

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Documentation Updates

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Important

Refactor UnboundHandler in unbound.ts to use model info for selecting cache breakpoint logic, adding support for Gemini and Anthropic models.

• Behavior:
  • Refactor createMessage in unbound.ts to use model info for cache breakpoints.
  • Calls addGeminiCacheBreakpoints for models starting with google/.
  • Calls addAnthropicCacheBreakpoints for models starting with anthropic/.
• Imports:
  • Add import for addGeminiCacheBreakpoints from caching/gemini.
  • Rename addCacheBreakpoints to addAnthropicCacheBreakpoints from caching/anthropic.

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