[appkit plugin] Add pnpm workspace for JS packages #542

Job	Run time
format	12s
typechecking for integrations/llamaindex	11s
typechecking for integrations/dspy	10s
typechecking for integrations/openai	13s
ruff check for integrations/llamaindex	11s
ruff check for integrations/dspy	11s
ruff check for .	13s
ruff check for integrations/langchain	15s
typechecking for .	14s
typechecking for databricks_mcp	14s
ruff check for databricks_mcp	9s
ruff check for integrations/openai	10s
typechecking for integrations/langchain	13s
	2m 36s

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