Map itemprop meta tags to JSON-LD.

[mworrell]

This pull request adds support for extracting and normalizing JSON-LD data and HTML microdata (using itemscope, itemtype, itemid, and itemprop) into JSON-LD-style maps in the z_url_metadata module. The metadata extraction now returns a json_ld property containing all decoded JSON-LD blocks and normalized microdata, making it easier to work with structured data from web pages. The changes include updates to the metadata structure, extraction logic, property access, and comprehensive tests for these features.

JSON-LD and Microdata Extraction:

• Added extraction and normalization of JSON-LD and HTML microdata into a new json_ld property in the metadata structure, with support for both <script type="application/ld+json"> blocks and itemscope-based microdata. Microdata is normalized to JSON-LD maps, with schema.org types using "https://schema.org" as @context. (F8036545L541R1028, [1] [2] [3] [4]

• Updated the p/2 property accessor and metadata type definitions to support the new json_ld property. [1] [2] [3]

HTML Attribute and Metadata Handling:

• Added support for recognizing itemid, itemprop, itemscope, and itemtype as valid HTML attributes to enable correct parsing of microdata.

• Improved handling of meta tag property names by normalizing certain property names to lower case for consistency (e.g., datePublished → datepublished).

Documentation and Testing:

• Updated the README.md to document how to access the new json_ld property and describe the normalization process for microdata.

• Added comprehensive tests for extracting and normalizing JSON-LD and microdata, including cases for YouTube video metadata, nested microdata, and JSON-LD scripts.

Dependencies:

• Added jsxrecord as a dependency for decoding JSON-LD data.

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