Simple Fees - HAPI tests for Crypto Service - CryptoApproveAllowance

Implement HAPI tests suite validating Simple Fees behaviour for Crypto Service - CryptoApproveAllowance 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 test entry point for the CryptoApproveAllowance transaction and read the HIP-1261 Simple Fees requirements. Add positive, negative, and corner-case coverage for key shapes, signature patterns, and extras such as additional signatures and keys. Done means the tests verify fee calculation, USD charging, and error handling.

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