[balancecontrol] Code generation: update services and models

[AdyenAutomationBot]

This PR contains the automated changes for the balancecontrol service.

The commit history of this PR reflects the adyen-openapi commits that have been applied.

[gemini-code-assist]

Summary of Changes

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This pull request delivers an automated update to the balancecontrol service's generated code. The core enhancement focuses on refining how optional fields are handled during JSON serialization and deserialization. By introducing explicit tracking for set properties and a configuration for including null values, the API client becomes more robust and precise in its interaction with the API, particularly for fields that might be intentionally omitted or set to null.

Highlights

• Automated Code Generation Update: This pull request contains automated updates to the balancecontrol service, reflecting recent changes in the adyen-openapi specification.
• Explicit Null Value Handling: Model classes such as Amount, BalanceTransferRequest, and BalanceTransferResponse now include mechanisms to explicitly track and serialize null values in JSON payloads. This is achieved through new isSet boolean flags for each property and an includeNullValues configuration.
• Improved Object Equality and Hashing: The equals() and hashCode() methods in the affected model classes have been updated to incorporate the new isSet flags, ensuring more accurate comparison and hashing behavior when dealing with explicitly unset or null properties.

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