[Feature] Support passing tool-use parameters to OpenAI-compatible client in Oumi inference config

### Feature request We want to be able to pass parameters such as tools=[{"type": "web_search"}] from an Oumi inference config to enable requests like the following: ``` from openai import OpenAI client = OpenAI() sample_search_request = "search for blah blah blah..." response = client.responses.create( model="gpt-5", tools=[{"type": "web_search"}], input=sample_search_request ) print(response.output_text) ``` ### Motivation / references (internal: https://linear.app/oumi/issue/OPE-1803) ### Your contribution I will submit a PR for this (medium priority)