[Question]: Support for Aleph Alpha Luminous Models via API

Describe the issue

I propose integrating Aleph Alpha's Luminous models through their API into LLMLingua to address performance concerns with local model execution. Aleph Alpha supports returning logprobs for both prompts and generated text:

https://docs.aleph-alpha.com/api/complete/

**echo**
boolean
Default value: false
Echo the prompt in the completion. This may be especially helpful when log_probs is set to return logprobs for the prompt.

**log_probs**
integer
NULLABLE
Number of top log probabilities for each token generated. Log probabilities can be used in downstream tasks or to assess the model's certainty when producing tokens. No log probabilities are returned if set to None. Log probabilities of generated tokens are returned if set to 0. Log probabilities of generated tokens and top n log probabilities are returned if set to n.

This integration could significantly speed up executions compared to running default models locally, aligning with similar interests shown in issue #70