multi model support

[realcodywburns]

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Add openai, huggingface, and ai21 basic interaces.

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update lang model and env to support sever model types and manage the output

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not doing this was considered, seemed lame

Additional context
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add support for configured api service foe openapi and hugging face. support chat and completion mvp

• smoke check of split files with env
• create test payloads
• test query
• test completion
• test chat