feat: Add publisher agent, merge code with streaming template (#324)

.../components/engines/typescript/agent/tools/interpreter.ts

templates/components/multiagent/python/README-template.md

templates/components/multiagent/python/app/agents/multi.py

templates/components/multiagent/python/app/agents/planner.py

templates/components/multiagent/python/app/agents/single.py

...ates/components/multiagent/python/app/api/routers/chat.py

...ents/multiagent/python/app/api/routers/vercel_response.py

templates/components/multiagent/python/app/engine/engine.py

...components/multiagent/python/app/examples/choreography.py

...components/multiagent/python/app/examples/orchestrator.py

...es/components/multiagent/python/app/examples/publisher.py

...s/components/multiagent/python/app/examples/researcher.py

...tes/components/multiagent/python/app/examples/workflow.py

...lates/components/multiagent/typescript/workflow/agents.ts

...ates/components/multiagent/typescript/workflow/factory.ts

templates/components/multiagent/typescript/workflow/tools.ts

templates/types/multiagent/fastapi/app/api/__init__.py

...ates/types/multiagent/fastapi/app/api/routers/__init__.py

...s/types/multiagent/fastapi/app/api/routers/chat_config.py

templates/types/multiagent/fastapi/app/api/routers/models.py