[capital] Code generation: update services and models

[AdyenAutomationBot]

This PR contains the automated changes for the capital service.

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

[gemini-code-assist]

Summary of Changes

Hello @AdyenAutomationBot, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly expands the Adyen Capital API by introducing a wide array of new models and services. These additions enable more granular management of financial grants, disbursements, and diverse international bank account identifications, reflecting an updated OpenAPI specification for the Capital service.

Highlights

• New Capital API Models: Introduced a comprehensive suite of new data models for the Capital API, covering various financial entities such as Amount, Balance, Action, Counterparty, Disbursement, Fee, FundsCollection, Grant, GrantAccount, GrantOffer, Repayment, and ThresholdRepayment.
• Extensive Bank Account Identification Support: Added detailed local bank account identification models for numerous countries including Australia, Brazil, Canada, Czech Republic, Denmark, Hong Kong, Hungary, New Zealand, Poland, Sweden, Singapore, United Kingdom, and United States, alongside generic IBAN and NumberAndBic identification.
• New Capital API Services: Implemented new API services: GrantAccountsApi for managing grant accounts, GrantOffersApi for handling grant offers, and GrantsApi for managing grants and their disbursements.
• OpenAPI Schema Handling: Incorporated AbstractOpenApiSchema and JSON utility classes to enhance the handling of OpenAPI oneOf/anyOf schemas and improve JSON serialization/deserialization.

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[gemini-code-assist]

Code Review

This PR introduces a large number of new model and service classes for the capital service, apparently generated from an OpenAPI specification. My review has identified a few systematic issues in the generated code that should be addressed in the generator templates to improve code quality and prevent potential bugs.

Specifically:

• The equals() and hashCode() methods in many model classes incorrectly include internal state flags (isSet...), which violates their contracts and can cause issues with collections. This is a critical issue.
• A required query parameter in GrantsApi.getAllGrants is not being enforced, which could lead to invalid API requests.
• There's an inconsistency in how unknown enum values are handled during deserialization; some enums return null while others throw an exception. The latter is preferred for robustness.

I've provided specific examples and suggestions for these issues. Addressing them in the generator will ensure all current and future generated code is correct and consistent.

[jeandersonbc]

Resolved some comments as not applicable and the required query params is address in #1665