support ray job submit to run p2p agent

[dongwang218]

Why ?

currently p2p agent example code lives inside matrix repo, we want to support using ray job submit to run example code from any where.

How ?

• call ray.init() without any parameters to allow passing the job sumitted code and path
• remove @ray.remote() to allow Sink override

Test plan

ray job submit \
  --address="http://$hostname:$dashboard_port" \
  --working-dir . \
  -- bash -c 'echo "Working directory: $(pwd) on $(hostname)" && ls $(pwd) && python -m matrix.agents.p2p_agents --config-path=$(pwd) --config-name=generate_tasks max_concurrent_tasks=1 dataset.cut_off=10 resources.llm.matrix_service=gpt120b'