LiteLMM Support

[ramoneees]

I faced a few issues while adding litelllm. So I'm adding the litelllm support to contribute to the project. Also with a bugfix with the secret key

[tmseidel]

@ramoneees You're welcome, be sure to use the current branch develop, since the last release we added native tool-calls to the llm-providers, so the interface changed in comparison to main