feat: ChatAgent support api key as parameter

[Wendong-Fan]

Description

allow user pass their openai key as argument in ChatAgent

Motivation and Context

close #550

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Implemented Tasks

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[yiyiyi0817]

Thanks for your contribution. Some comments.

And another question for other agents‘ code, I noticed that all agents, including CriticAgent, DeductiveReasonerAgent, EmbodiedAgent, RoleAssignmentAgent and TaskSpecifyAgent, inherit from ChatAgent. What about add codes such as

super().__init__(
  system_message,
  model_type=model_type,
  model_config=model_config,
  output_language=output_language,
  _api_key = api_key
)

for all of them.

[yiyiyi0817]

Add explanation to point out that the api_key parameter is only support openai api key now?

[yiyiyi0817]

ValueError: If the API key is not found, either as an environment variable or directly passed.