Mock transactions download endpoint

[glad-adyen]

Summary

This PR introduces changes required for mocking the transactions download endpoint.

Fixed issue: IEX-1222: Create mock data for transactions export endpoint

[gemini-code-assist]

Summary of Changes

Hello @glad-adyen, 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 establishes the foundational elements for a new feature allowing the download of transaction data. It defines the endpoint's structure, integrates it into the mock server for development purposes, and updates the API's type definitions to ensure proper handling of the CSV output and associated filtering parameters. This work directly addresses the requirement to create mock data for the transaction export functionality.

Highlights

• New API Endpoint: Introduced a new API endpoint /transactions/download for exporting transaction data.
• Mocking Support: Implemented mocking for the new transaction download endpoint to facilitate development and testing.
• Type Definition Updates: Updated API type definitions to include the new downloadTransactions endpoint, specifying its CSV response format and query parameters.

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[gemini-code-assist]

Code Review

This pull request sets up the necessary definitions and mock server configuration for a new transactions download endpoint. The changes are well-structured and consistent with the existing codebase. I've identified a couple of areas for improvement in the API type definition file: one regarding the accuracy of a comment, and a more significant one concerning the process of updating auto-generated files.