[playground][ui] openai tool schemas containing anyOf are parsed as invalid

[axiomofjoy]

anyOf is allowed in tools schemas for OpenAI, but is parsed as being invalid in playground.

Schema:

{
    "type": "function",
    "function": {
        "name": "create_booking",
        "description": "Creates a booking on the user's behalf",
        "parameters": {
            "type": "object",
            "properties": {
                "place_id": {
                    "type": "string",
                    "description": "The ID of the place to create a booking for"
                },
                "booking_details": {
                    "anyOf": [
                        {
                            "type": "object",
                            "description": "Restaurant booking with specific date and time",
                            "properties": {
                                "date": {
                                    "type": "string",
                                    "description": "The date of the booking, in format YYYY-MM-DD"
                                },
                                "time": {
                                    "type": "string",
                                    "description": "The time of the booking, in format HH:MM"
                                }
                            },
                            "required": ["date", "time"]
                        },
                        {
                            "type": "object",
                            "description": "Hotel booking with specific check-in and check-out dates",
                            "properties": {
                                "check_in": {
                                    "type": "string",
                                    "description": "The check-in date of the booking, in format YYYY-MM-DD"
                                },
                                "check_out": {
                                    "type": "string",
                                    "description": "The check-out date of the booking, in format YYYY-MM-DD"
                                }
                            },
                            "required": ["check_in", "check_out"]
                        }
                    ]
                }
            },
            "required": ["place_id", "booking_details"],
            "additionalProperties": false
        }
    }
}

Example question:

Book a table at place ID '12345' for January 15, 2025, at 7:00 PM.

[axiomofjoy]

@cephalization Noticed this while adding backend validation for tool schemas.