chore: update @hashgraph/sdk dependency to @hiero-ledger/sdk

[themariofrancia]

This pull request updates the codebase to replace all usages of @hashgraph/sdk with @hiero-ledger/sdk version 2.79.0 across multiple packages and files. This change ensures consistency in SDK usage and prepares the codebase for compatibility with the newer SDK. In addition, some minor code style improvements (such as string formatting) were made for consistency.

SDK migration and dependency updates:

• All references to @hashgraph/sdk in package.json files for apps/mass-payout/backend, packages/ats/contracts, packages/ats/sdk, packages/mass-payout/contracts, and packages/mass-payout/sdk have been replaced with @hiero-ledger/sdk@2.79.0. [1] [2] [3] [4] [5]
• All import statements referencing @hashgraph/sdk have been updated to use @hiero-ledger/sdk in TypeScript source files and tests. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10]

Code consistency and style improvements:

• Standardized string quotes from single to double quotes in several files for consistency. [1] [2] [3] [4] [5] [6] [7]
• Minor code formatting adjustments, such as improved string handling and multi-line formatting in classes like BigDecimal, ContractId, and HederaId. [1] [2] [3] [4] [5] [6] [7] [8]

Documentation updates:

• Updated documentation in README.md to reference @hiero-ledger/sdk instead of @hashgraph/sdk, including usage examples and dependency lists. [1] [2]

These changes collectively migrate the codebase to use the new Hedera SDK, improve maintainability, and ensure all documentation and code are up-to-date.

[hedera-eng-infrastructure]

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