[Feature Request] Simplify the role system in camel

[lightaime]

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Motivation

The original camel paper introduces RoleType to manage prompts for RolePlaying:

https://github.com/camel-ai/camel/blob/master/camel/prompts/ai_society.py
https://github.com/camel-ai/camel/blob/master/camel/societies/role_playing.py

which may not be generalized to other scenerio and may cause confusion with backend models' role in message. We need a better way to simplify it.

Solution

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Alternatives

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Additional context

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