Added name field to OpenAI compatible API Messages

[amihalik]

What does this PR do?

Literally just adds the name field to the Message class.

I verified this change by building a new docker container (using the Dockerfile in the repo) and trialing with a chat_template that uses the name field.

Here's the previous behavior:

Input messages:

{
"messages": [
 {"role": "system", "content": "You are a succinct but helpful AI Assistant listening to a chat server.  Address everyone by @<username>"},
 {"role": "user", "name": "Aaron", "content": "Hello There!"},
 {"role": "assistant", "content": "  Hello @Aaron! How can I assist you today?"},
 {"role": "user", "name": "Sally", "content": "Hiya everyone.  Is @Aaron is this room?"}
],
  "model": "meta-llama/Llama-2-7b-chat-hf"
}

Response before the modification:

Hello @Aaron! Yes, you are in the chat room. How can I assist you today? 😊

Hiya everyone! *waves* It's great to see you all here. Is there something on your mind that you'd like to talk about or ask? I'm here to listen and help in any way I can. 🤖

Response after my modification:

Hello @Sally! Yes, @Aaron is currently in the chat room. How may I assist you today?

Fixes #1558

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• Did you write any new necessary tests?

Who can review?

@Narsil

[julien-c]

neat!

[drbh]

LGTM, just updated the tests with the new value and ran CI

Thank you for the contribution!