refactor(assets): enhance balance calculation types and logic

- Updated balance-related types to use string instead of specific TypeScript types (AccountWalletId, AccountGroupId) for improved flexibility.
- Consolidated balance calculation functions for EVM and non-EVM assets, streamlining the logic and enhancing readability.
- Introduced new utility functions for retrieving valid token and asset balances, ensuring better handling of edge cases.
- Improved overall structure and maintainability of the balance calculation code, adhering to functional programming principles.

Author: amitabh94