Implement structure element containment rules for ISO 32000-2 and ISO TS 32005

[petervwyatt]

Implement structure element containment rules for:

• ISO 32000-2:2020 Annex L for PDF 2.0 tags
• additionally ISO TS 32005 for PDF 1.7 tags (which also applies to WTPDF)

These should be identifiably separate, since the PDF 2.0 containment rules always apply to all PDF 2.0 whereas ISO TS 32005 applies to PDF/UA-2 and PDF 2.0 files with a 32005 XMP PDF Declaration as that adds the PDF 1.7 tags to the Annex L rules.

This might be done using a child/parent matrix that can be simply derived from the current machine-readable XSLX files in each ISO spec. For practical reasons, this probably shouldn't be a .tsv file in the same manner as the other Arlington model files. Such a 2D matrix might be considered as supplemental to the model - and passed in with a new CLO option.

Alternatively, use a script to generate a LOT(!) of Arlington predicates and bake directly into the model.

NOTE: veraPDF has an XML version of ISO TS 32005: https://github.com/veraPDF/veraPDF-validation-profiles/blob/integration/PDF_UA/ISO-32005-Tagged.xml