Customize request parameters

It is hoped to add custom request parameters that are compatible with different AI models

For example：Spark LLM，

https://www.xfyun.cn/doc/spark/HTTP%E8%B0%83%E7%94%A8%E6%96%87%E6%A1%A3.html#_3-%E8%AF%B7%E6%B1%82%E8%AF%B4%E6%98%8E

The following is this document. In the request parameters, there are

"suppress_plugin": [
        "knowledge"
]

It is hoped that some custom request parameters or request headers can be added。
For example, the functions implemented in the dependencies of openai-java
The following is the description of this dependency customizing in the request parameters

https://github.com/openai/openai-java?tab=readme-ov-file#undocumented-api-functionality

ChatCompletionCreateParams params = ChatCompletionCreateParams.builder()
    .putAdditionalHeader("Secret-Header", "42")
    .putAdditionalQueryParam("secret_query_param", "42")
    .putAdditionalBodyProperty("secretProperty", JsonValue.from("42"))
    .build();

Start by reading the Spark LLM request documentation and the openai-java README section on undocumented API functionality. Identify the request-building entry points and existing tests for request bodies, headers, and query parameters; done means a defined approach for custom parameters that supports the cited examples across relevant AI models.