fix(api): add createEvent method and EventsApiCreateEventRequest type…

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What does this PR do?

This PR introduces the createEvent method in the v2.EventsApi, along with the EventsApiCreateEventRequest type. The primary goal is to provide event creation functionality within the v2 API.

Key Changes:

• Implemented createEvent method: This method allows users to create events within the EventsApi.ts file.
• Defined EventsApiCreateEventRequest interface: The interface includes all required properties for event creation.
• Exported the new method and interface: The method and type are exported via v2/index.ts.
• Addresses Issue v2.EventsApi missing createEvent and EventsApiCreateEventRequest #1941: Resolves the missing functionality in the v2 API as outlined in the referenced issue.

Motivation

This feature is essential for enabling event creation in the v2 API, a critical component for our users. The implementation addresses a known gap in functionality, improving the API's overall usability and alignment with user expectations.

Related Issue: datadog-api-client-typescript#1941
This PR directly addresses the issue described above.

Additional Notes

• All changes are backward-compatible and adhere to the existing API patterns.
• The implementation includes adequate error handling and follows the project's coding standards.
• Tests for the new functionality have been added, ensuring robustness and reliability.

Review checklist

Please check relevant items below:

• This PR includes all newly recorded cassettes for any modified tests.
• This PR does not rely on API client schema changes.
  • The CI should be fully passing.
• Or, this PR relies on API schema changes and this is a Draft PR to include tests for that new functionality.
  • Note: CI shouldn't be run on this Draft PR, as it's expected to fail without the corresponding schema changes.

[github-actions]

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