Add initialization utils for LLM-based simulator #201
Description
Update usersimcrs/utils/simulation_utils.py to integrate initialization of LLM-based simulators: SinglePromptUserSimulatorand DualPromptUserSimulator.
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Update usersimcrs/utils/simulation_utils.py to integrate initialization of LLM-based simulators: SinglePromptUserSimulatorand DualPromptUserSimulator.