feat: Add more. env variables to config host, port, llm and embedding (#630)

.changeset/dull-toes-pull.md

packages/create-llama/helpers/env-variables.ts

packages/create-llama/helpers/index.ts

packages/create-llama/helpers/typescript.ts

...ama/templates/components/engines/python/agent/__init__.py

...lama/templates/components/engines/python/chat/__init__.py

...templates/components/loaders/python/llama_parse/loader.py

...eate-llama/templates/types/simple/fastapi/app/settings.py

packages/create-llama/templates/types/simple/fastapi/main.py

...e-llama/templates/types/streaming/fastapi/app/settings.py

...es/create-llama/templates/types/streaming/fastapi/main.py