[RFE]Generic OpenAI compatible Provider

[xrajesh]

Is your feature request related to a problem? Please describe.
Today , we support providers with OpenAI compatible API and we differentiate them with types ( openai, rhelai_vllm etc) . We need a provider config which is very generic for any OpenAI compatible provider , and have the ability to specify the various authorization mechanisms . Recently, we observed a usage where the OpenAI compatible service with rotating tokens. But overall if we can provide a support for any OpenAI compatible provider, then we do not have to keep extending the types.

Describe the solution you'd like
Config needs to provide a support for any OpenAI compatible provider with its Authorization mechanism .