Starts a job to fetch historical token balances for the provided account address at a specific timestamp.

This is an asynchronous operation that will return a job ID and a URL to check the results.

The job will process in the background, and results will become available once the calculation is complete.

After starting the job:

1. Use the returned jobId to check the results via the corresponding GET endpoint
2. If you get a 425 status code, retry after a short interval until you get a result

Processing time depends on how far back in time the requested timestamp is and the transaction volume of the account.