Module hiero-base miss tests for functionality of AccountClientImpl.getAccountBalance

[hendrikebbers]

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👾 Description of the issue

In the hiero-base module, the AccountClientImpl class implements the getAccountBalance method to retrieve the HBAR balance of a given account using the ProtocolLayerClient. However, this method currently lacks unit and integration tests. Tests for scenarios such as valid account IDs, zero balances, invalid inputs, and exception handling (e.g., HieroException) are missing, leaving this functionality unverified and prone to potential bugs.

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Create a new test class or extend the existing test suite for AccountClientImpl to include tests for the getAccountBalance method. Follow the established testing pattern using JUnit to validate both positive and negative scenarios for this method.

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