autogenerate comprehensive llm xpack swagger docs (#5690) #85

Job	Run time
test-macos / Build packages (3.10, ec2-macOS)	16m 5s
test-macos / ec2-macOS pytest	4m 29s
test-macos / ec2-macOS pytest	4m 5s
test-macos / Notify_on_failure	0s
	24m 39s

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