fix: add mon to currencies list

[salimtb]

Explanation

The current list of supported currencies in the token prices service was missing MON (Monad). This addition ensures that token prices can be properly fetched and displayed for users who have Monad set as their preferred currency.

The solution adds 'mon' to the SUPPORTED_CURRENCIES array in the CodeFi V2 token prices service, maintaining alphabetical order and including an appropriate comment for clarity.

References

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

---

Note

Adds mon (Monad) to the token prices service supported currencies and updates the changelog.

• Token Prices Service:
  • Add mon to SUPPORTED_CURRENCIES in packages/assets-controllers/src/token-prices-service/codefi-v2.ts.
• Docs:
  • Update packages/assets-controllers/CHANGELOG.md to note MON support.

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