Allow for custom Ktor HttpClientPlugin installations

[rasharab]

Feature Description

Allow for OpenAI HttpClient to install custom Ktor HttptClientPlugins.

Problem it Solves

Our team has custom plugins that upload telemetry for various ktor clients.
They extend HttpClientPlugin.

Currently, we're using reflection to install our own HttpClient/HttpTransport to openai-kotlin's OpenAIApi instance.
This is untenable and we'd like for first-class support.

Proposed Solution

There are several ways of doing this:

Solution1:
Add configuration parameter in OpenAIConfig called plugins:

public val plugins: List<HttpClientPlugin<*, *>

And install those plugins in HttpClient.

        config.plugins.forEach {
            install(it)
        }

Solution2:

Add a configuration parameter for a lambda to do custom configuration of the HttpClientConfig. More error prone.

public val configure: HttpClientConfig<*>.() -> Unit = {}

And run that configuration in HttpClient:

config.configure.invoke(this)

I will probably get a PR up to address this soon, but don't want to do unnecessary work if the maintainer doesn't want this.

[aallam]

I've been trying to keep Ktor as an implementation detail, but I've been seeing more requests to configure the client. So, why not? Solution 2 looks good to me!

[rasharab]

Completely understand your thought process there.
Alas, can't think of a super clean way of doing this otherwise.
I'll forward a pr shortly.
Thanks for creating this package...

[rasharab]

First stab:
https://github.com/aallam/openai-kotlin/pull/239/files

[aallam]

Version 3.4.2 is released with your changes! thanks again for your contribution! 🎉

[rasharab]

Thank you again!