Redesign of Julia interop, avoiding Jupyter kernel

[kris-brown]

This PR simplifies a lot of the structure of the CatColabInterop.jl package.

It introduces a new analysis of schema instances by sending the diagram to Catlab, where it is processed by @acset_colim to produce a tabular instance.

(This is currently a WIP - once the workflow is working for the tabular view analysis, the existing Decapodes analysis will be brought back into functionality).

[github-actions]

Preview url: https://69129e9bcce9a09af44bd047--catcolab.netlify.app

[kasbah]

You should be able to do this without axios, using native fetch instead. It's a bit more code but also more explicit about what's going on. Something like:

async ([model, diagram]) => {
    const response = await fetch(
        "http://127.0.0.1:8080/acsetcolim",
        {
            method: "POST",
            headers: {
                "Content-Type": "application/json",
                ...config.headers,
            },
            body: JSON.stringify({
                model: model?.presentation(),
                diagram: diagram?.presentation(),
            })
        },
    );
    
    if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`);
    }
    
    return response.json();
}