AI API: new endpoints support

[andrii-bodnar]

Crowdin's API has been greatly expanded to include new endpoints for the latest Crowdin AI features.

We need to update the Crowdin API client to support these new endpoints.

References:

• Generate AI Prompt Fine-Tuning Dataset
• Get AI Prompt Fine-Tuning Dataset Generation Status
• Create AI Prompt Fine-Tuning Job
• Get AI Prompt Fine-Tuning Job Status
• Download AI Prompt Fine-Tuning Dataset
• Check other AI methods and their parameters.