[appkit plugin] [2/x] Add @databricks/appkit-agent package #549

Job	Run time
format	12s
ruff check for integrations/openai	10s
typechecking for integrations/dspy	15s
ruff check for databricks_mcp	13s
typechecking for databricks_mcp	9s
ruff check for .	15s
typechecking for integrations/llamaindex	11s
ruff check for integrations/langchain	12s
typechecking for integrations/openai	11s
ruff check for integrations/llamaindex	12s
typechecking for integrations/langchain	12s
typechecking for .	11s
ruff check for integrations/dspy	12s
	2m 35s

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