Create an OpenAPIEndpointChain from an operation and a spec.
from_api_operation(
cls,
operation: APIOperation,
llm: BaseLanguageModel,
requests: Optional[Requests] = None,
verbose: bool = False,
return_intermediate_steps: bool = False,
raw_response: bool = False,
callbacks: Callbacks = None,
**kwargs: Any = {}
) -> 'OpenAPIEndpointChain'