Option to align route params with schema at startup

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the feature has not already been requested

Feature Proposal

Introduce startup validation in Fastify to check consistency between route parameters in path strings and schema definitions.

Motivation

Ensuring route parameter consistency to prevent runtime errors

Example

// Inconsistent route params and schema could lead to unnoticed issues until runtime
fastify.get('/item/:itemId', {
  schema: {
    params: {
      type: 'object',
      properties: {
        id: { type: 'string' } // Potential issue: 'itemId' in route vs 'id' in schema
      }
    }
  },
  handler: (request, reply) => { /* ... */ }
});

A pre-runtime check could catch these mismatches early, enhancing developer experience and application stability.