MCP plugin: migrate to registerTool

[karlismelderis-mckinsey]

McpServer 'tool' function is deprecated and can be replaced with registerTool

registerTool tool adds more options to document MCP tool

        title?: string;
        description?: string;
        inputSchema?: InputArgs;
        outputSchema?: OutputArgs;
        annotations?: ToolAnnotations;
        _meta?: Record<string, unknown>;

we can do extra mapping from API spec:
title -> endpoint summary
description -> endpoint description
inputSchema -> same as today
outputSchema -> should allow to expose API response and maybe even allow to avoid stringifying response

annotations are also opening interesting options (e.g. mark API as "idempotent" or "destructive") but I don't see how to map it with API in flexible and reusable way

[stijnvanhulle]

@karlismelderis-mckinsey Fixed as part of Kubb 4.31.3