Add Slurm Integration for Cluster Job Management

[ykitanob]

This PR adds Slurm integration to OpenCRAVAT, enabling annotation jobs to be submitted to cluster environments via sbatch. When users click the "ANNOTATE" button, jobs are automatically submitted to the Slurm queue.

Key Features
Slurm Job Submission: Seamless integration with sbatch command
Configuration Support: New slurm_config_example.yml with setup examples
Job Management: Full lifecycle management including monitoring and cancellation
Resource Optimization: Configurable worker count to prevent resource overuse
Enable with use_slurm: true in cravat-system.yml. See slurm_config_example.yml for configuration details.

[RachelKarchin]

Hi @ykitanob

Thanks very much for your PR. We are reviewing and will get back to you soon.

[kmoad]

Hi @ykitanob

We appreciate this PR. SLURM integration would be helpful.

Unfortunately, we are close to releasing an updated backend for OpenCRAVAT based on flask for request handling, and celery for job management. This code would have to be ported over to the new backend to remain useable.

We'd be happy to work with you on enabling SLURM support on the new backend though. The code is in feat/flask-api. Are you open to working with us to get a slurm integration there?