List Transactions
Retrieves all transactions for the specified account with optional filtering.
Filter options:
- Date-based filtering: Use start_date, end_date, and timezone together
- Datetime-based filtering: Use start_datetime and end_datetime (timezone-aware, e.g., 2026-02-17T00:00:00Z)
- Cannot mix date and datetime filters
- Filter by transaction_type (CREDIT/DEBIT) and transaction_status (PENDING/POSTED)