Anthropic (Claude) provider

[brichet]

This PR adds the Anthropic provider as a chat model.
It does not include completion.

[brichet]

I added a first version of code completion.
The idea is to give a context to the AI, and to send the current prompt as a message to complete.
The 2 issues I have so far are:

• it is really slow on my side
• anthropic raises if there is a space at the end of the prompt. Currently this PR is removing it, but it can lead to wrong suggestions

[jtpio]

Thanks @brichet for looking into this 👍

I just tried this PR locally and there seems to be many requests made to the anthropic API, so maybe there is indeed something not expected happening:

jupyterlite-anthropic.webm

[jtpio]

Interestingly when testing with Jupyter AI, completions don't seem to work and trigger some warnings in the dev tools console:

jupyter-ai-lab-434-anthropic.webm

The Jupyter Server logs also show some long response time for the inline completer:

[brichet]

Thanks for testing it @jtpio

Using Anthropic completion with jupyter-ai do not trigger error on my side, but the suggestions are not really relevant (most of the time):

Indeed, you're right about the extra requests, I'll take a closer look.

[jtpio]

Using Anthropic completion with jupyter-ai do not trigger error on my side, but the suggestions are not really relevant (most of the time):

Indeed according to your screenshot there seems to be an issue with how Jupyter AI handles the inline completer suggestions. So likely an issue in Jupyter AI (we could open one if non exists already)