feat: Add support for uvicorn workers for llama-stack

[VaishnaviHire]

Fixes #164
Expose worker field in LlamaStackDistribution CR

Example CR

spec:
  server:
    containerSpec:
      env:
        - name: OLLAMA_INFERENCE_MODEL
          value: 'llama3.2:1b'
        - name: OLLAMA_URL
          value: 'http://ollama-server-service.ollama-dist.svc.cluster.local:11434'
      name: llama-stack
    distribution:
      name: starter
    workers: 2