Simple Fees - HAPI tests for Consensus Service - ConsensusGetTopicInfo

Implement HAPI tests suite validating Simple Fees behaviour for Consensus Service - ConsensusGetTopicInfo transaction under HIP-1261. The suite should cover positive, negative and corner cases, exercising different key shapes, signature patterns and extras (e.g. additional signatures, keys, etc.) to confirm that fee calculation, charging in USD and error handling follow the new Simple Fees logic and requirements.

Start by reading HIP-1261 and the ConsensusGetTopicInfo requirements, then inspect the repository's existing HAPI tests for Simple Fees behavior. The work is complete when positive, negative, and corner cases cover key shapes, signature patterns, extras, USD charging, fee calculation, and error handling.

Written by the indexing model from the issue text.