Chore: fetch price api supported chain ids

[sahar-fehri]

Explanation

Price api already exposes its supported chainIds here https://price.api.cx.metamask.io/v1/supportedNetworks. Instead of relying on the old static array; this array pulls the supported chainIds from the API directly.

This would make it possible in future to add support for new tokens without making a core relase.

References

• Related to Extension: https://github.com/MetaMask/metamask-extension/pull/37416

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, highlighting breaking changes as necessary
• [ ] I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

---

[!NOTE] Replaces the static supported-chain list with a dynamic fetch from the Price API, adds a cached supportedChainIds state to TokenRatesController, and updates APIs/types to use it.

• Token Prices Service (codefi-v2):
  • Add fetchSupportedChainIds() (uses GET /v1/supportedNetworks), return hex chain IDs.
  • Remove exported SUPPORTED_CHAIN_IDS and validateChainIdSupported.
  • Generalize types to Hex chain IDs; keep getNativeTokenAddress.
• TokenRatesController:
  • Add supportedChainIds cache in state with timestamp and DEFAULT_CACHE_REFRESH_THRESHOLD (24h).
  • Validate chains against cached supportedChainIds; auto-refresh cache when stale.
  • Update default state/metadata and polling/update flows accordingly.
• Utils (assetsUtil):
  • fetchTokenContractExchangeRates now requires supportedChainIds arg and uses it for chain validation.
• Exports:
  • Remove SUPPORTED_CHAIN_IDS from public exports.
• Tests/Docs:
  • Update tests across packages and changelog to reflect new API and behavior.

^{Written by Cursor Bugbot for commit 8315c2ecc061b6211034509540d1c24aa9648db3. This will update automatically on new commits. Configure here.}

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