Add ability to choose LLM prompt template for value generation and flow generation #34

Job	Run time
call-tests (macOS, 3.10) / macOS / Python 3.10	3m 37s
call-tests (macOS, 3.11) / macOS / Python 3.11	3m 52s
call-tests (Ubuntu, ubuntu-latest) / Ubuntu / Python	3m 36s
call-tests (macOS, 3.9) / macOS / Python 3.9	4m 23s
call-tests (Windows, 3.10) / Windows / Python 3.10	6m 1s
call-tests (Windows, 3.11) / Windows / Python 3.11	6m 14s
call-tests (Windows, 3.9) / Windows / Python 3.9	6m 13s
	33m 56s

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