Refactor cep18 storage modules

[kpob]

Summary by CodeRabbit

• Refactor

  • Simplified and improved maintainability of token storage by using macro-based implementations for name, decimals, symbol, total supply, balances, and allowances.

• Bug Fixes

  • Enhanced balance retrieval and transfer logic to handle cases where balances may not exist, ensuring more accurate and reliable token operations.

[coderabbitai[bot]]

Walkthrough

The recent changes involve a significant refactor in the storage modules for a token, simplifying the code by using macros to handle common storage patterns. This change enhances maintainability and reduces redundancy. Additionally, the balance_of and raw_transfer functions in the Cep18 implementation have been updated to use get instead of get_or_default for balance retrieval, ensuring more precise handling of balance data.

Changes

File	Change Summary
modules/src/cep18/storage.rs	Refactored storage modules using macros for single and compound value storage.
modules/src/cep18_token.rs	Updated balance_of and raw_transfer functions to use get instead of get_or_default.

Poem

In the realm of code, a change so grand,
Macros now lend a helping hand.
Balances checked with precision's might,
Tokens transfer smooth, just right.
Simpler paths and cleaner ways,
For brighter, more maintainable days.

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