feat(utils): add Schema.org microdata extraction utility #3246
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Introduces #276
This PR adds a reusable function extractSchemaOrgMicrodata to the @crawlee/utils package.
It enables extracting Schema.org microdata from:
The extractor uses only native DOM APIs, no jQuery dependency.
The extractor is fully serializable, allowing it to run both in a browser context (via page.evaluate in Puppeteer/Playwright) and in Node.js environments (JSDOM/Cheerio), with no external dependencies.
Comprehensive test cases are included to ensure correct extraction across different input types.