Create split_by_llm_categorize

[ericnewcomer]

We need to create a new kind of node in the flow editor that does the following:

Allows the user to specify:

• The AI Model to use (just like the call_llm action)
• The input to categorize, ie, @input
• A set of category names (we can likely use the array editor here). The names for the categories should not be able to be duplicated and should be limited to ten in total. The user provides their categories, but we always have a default "Other" category that is not shown and also a "Failure" category if the llm call fails.

This should use a call_llm action under the hood. We already have expressions for prompt and slice of categories to make this easy. Let's go with an example.. after saving with example categories of "Flights" and "Hotels", the user should be left with a node definition that looks something like this:

{
    "uuid": "145eb3d3-b841-4e66-abac-297ae525c7ad",
    "actions": [
        {
            "type": "call_llm",
            "uuid": "3cd8f2db-8429-462e-ab93-8041dd23abf1",
            "llm": {
                "uuid": "1c06c884-39dd-4ce4-ad9f-9a01cbe6c000",
                "name": "Claude"
            },
            "instructions": "@(prompt(\"categorize\", slice(node.categories, 0, -2)))",
            "input": "@input",
            "output_local": "_llm_output"
        }
    ],
    "router": {
        "type": "switch",
        "categories": [
            {
                "uuid": "6103fa71-6ca9-4300-aec6-929f50fa1ae0",
                "name": "Flights",
                "exit_uuid": "33712037-9861-4d61-9dcb-60d7fffef96a"
            },
            {
                "uuid": "bcb18434-1932-4a38-a4cd-a2c4a70b8e9a",
                "name": "Hotels",
                "exit_uuid": "fdd988ba-34c1-45a8-8413-e89b0a36001e"
            },
            {
                "uuid": "a766ac1a-766f-4ce5-be4c-a24061bfdec0",
                "name": "Other",
                "exit_uuid": "bbcb0d26-a8c4-48f7-9d39-eeb202d09876"
            },
            {
                "uuid": "e86a60b9-6e8e-4150-9ab9-19e6eb7003d9",
                "name": "Failure",
                "exit_uuid": "959d6e4c-658a-49fc-a80d-5ed7df5af640"
            }
        ],
        "default_category_uuid": "a766ac1a-766f-4ce5-be4c-a24061bfdec0",
        "operand": "@locals._llm_output",
        "result_name": "Intent",
        "cases": [
            {
                "uuid": "d2f852ec-7b4e-457f-ae7f-f8b243c49ff5",
                "type": "has_only_text",
                "arguments": [
                    "Flights"
                ],
                "category_uuid": "6103fa71-6ca9-4300-aec6-929f50fa1ae0"
            },
            {
                "uuid": "692926ea-09d6-4942-bd38-d266ec8d3716",
                "type": "has_only_text",
                "arguments": [
                    "Hotels"
                ],
                "category_uuid": "bcb18434-1932-4a38-a4cd-a2c4a70b8e9a"
            },
            {
                "uuid": "73bfb9dc-9bbb-4928-92fd-d8957edf4a92",
                "type": "has_only_text",
                "arguments": [
                    "<ERROR>"
                ],
                "category_uuid": "e86a60b9-6e8e-4150-9ab9-19e6eb7003d9"
            }
        ]
    },
    "exits": [
        {
            "uuid": "33712037-9861-4d61-9dcb-60d7fffef96a"
        },
        {
            "uuid": "fdd988ba-34c1-45a8-8413-e89b0a36001e"
        },
        {
            "uuid": "bbcb0d26-a8c4-48f7-9d39-eeb202d09876"
        },
        {
            "uuid": "959d6e4c-658a-49fc-a80d-5ed7df5af640"
        }
    ]
}

This should be accomplished using the action and node configs for the editor. If something is missing there to make this feature work, then it should be adapted accordingly.