[appkit plugin] [2/x] Add @databricks/appkit-agent package #558

Job	Run time
format	11s
ruff check for integrations/langchain	14s
ruff check for databricks_mcp	13s
typechecking for integrations/dspy	14s
typechecking for integrations/llamaindex	9s
ruff check for integrations/dspy	12s
ruff check for .	11s
typechecking for .	13s
typechecking for databricks_mcp	12s
typechecking for integrations/openai	16s
typechecking for integrations/langchain	10s
ruff check for integrations/llamaindex	9s
ruff check for integrations/openai	12s
	2m 36s

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