fix: List cache with different keys returns same result

[memoyil]

---

PR-Codex overview

This PR focuses on enhancing the type safety and immutability of token-related data structures in the @pancakeswap/tokens package by exporting the createEmptyList function and updating the return types of EMPTY_LIST and createEmptyList.

Detailed summary

• Changed createEmptyList from a private to an exported function.
• Updated createEmptyList to return a Readonly<TokenAddressMap<ChainId>>.
• Updated EMPTY_LIST to be of type Readonly<TokenAddressMap<ChainId>>.
• Modified the condition in combineTokenMaps to check for urls?.length.
• Adjusted the assignment of newTokens in combineTokenMaps for improved clarity.
• Changed listCache to store a Map<string, TokenAddressMap> instead of TokenAddressMap.
• Updated listToTokenMap to require a key parameter and adjusted its logic to handle the new listCache structure.

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Latest commit: 4f2e59104105dedada8099edbb594cfa7959c45f

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