Simple Fees - HAPI tests for Token Service - TokenUpdate

Implement HAPI tests suite validating Simple Fees behaviour for Token Service - TokenUpdate 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 locating the HAPI tests for the Token Service TokenUpdate transaction and read the HIP-1261 Simple Fees requirements. Add coverage for positive, negative, and corner cases involving key shapes, signature patterns, and extras; done means fee calculation, USD charging, and error handling are validated.

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