[APTOS] Fix token balances

[furenster]

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[gemini-code-assist]

Summary of Changes

Hello @furenster, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request aims to resolve an issue with how Aptos token balances are retrieved. It refactors the underlying mechanism for fetching balances, moving to a more direct service call for individual tokens. Additionally, it introduces concurrent processing to enhance the efficiency of querying multiple token balances simultaneously.

Highlights

• Balance Fetching Mechanism Update: The method for fetching Aptos token balances has been updated from querying general resources to directly calling the balance service for each token, providing a more direct and potentially efficient approach.
• Concurrent Balance Retrieval: Asynchronous operations using Kotlin coroutines (async, awaitAll) have been introduced to fetch multiple token balances concurrently, which is expected to improve performance, especially when dealing with a large number of tokens.

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[gemini-code-assist]

Code Review

This pull request refactors the token balance fetching logic for Aptos. The implementation is changed from a single bulk API call to fetching balances for each token concurrently. While the new implementation seems correct and handles errors for individual tokens gracefully, the associated tests have not been updated and are likely broken. Additionally, a comment explaining the rationale for this significant change in fetching strategy would improve code maintainability.