feat(utils): add schema.org microdata parser

[haroldfabla2-hue]

Summary

Adds a new function to extract schema.org structured data (microdata) from HTML pages, following the existing pattern of .

Changes

• New file:
• Exports function and constant
• Supports common schema.org properties: name, description, url, image, price, author, etc.
• Extracts all items with nested properties
• Handles aggregateRating and offers schemas
• Compatible with both raw HTML strings and CheerioAPI objects

Usage

import { parseSchemaOrg } from 'crawlee';

// From raw HTML
const result = parseSchemaOrg(html);

// From CheerioAPI
const result = parseSchemaOrg($);

// Result structure:
// {
//   items: [...],        // All itemscope items found
//   properties: {...}    // Common properties extracted globally
// }

Closes #276

[tomvonclef]

nice, but surely something like this should include tests