Integration: KAI Scheduler

[EkinKarabulut]

Why are these changes needed?

This adds the integration to KAI Scheduler.

What has been done?

• Integrate KAI Scheduler as a supported batch scheduler.
• Add KAI scheduler plugin integration.
• Provide sample YAMLs demonstrating KAI integration, including GPU sharing and gang scheduling.
• Update Helm chart values and documentation.
• Add tests for KAI scheduler functionality.

Checks

• I've made sure the tests are passing.
• Testing Strategy
  • Unit tests
  • Manual tests