feat: add Solana to the polled exchange rates

[ulissesferreira]

Explanation

As we aim to support more chains in the MetaMask extension we will need the exchange rates of the native tokens of these chains to properly value a user's account. Let's add Solana to the cryptocurrencies that we need to keep track of price.

References

Closes SOL-36

Changelog

@metamask/assets-controller

• feat: add Solana to the polled exchange rates

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 highlighted breaking changes using the "BREAKING" category above as appropriate
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

[github-actions]

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