feat: use `w:lastRenderedPageBreak` to get approximate pagination from docx

[dhdaines]

Sometimes (very far from always) we can get pagination from a Word document using the w:lastRenderedPageBreak element (https://ooxml.info/docs/17/17.3/17.3.3/17.3.3.13/). This supports that. Note that the resulting pagination is very approximate, and the provenance ~and page~ objects created are known to be false.

• [x] Documentation has been updated, if necessary.
• [x] Examples have been added, if necessary.
• [x] Tests have been added, if necessary.

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[dhdaines]

Rebased / fixed signoff / force-pushed!

[dhdaines]

hello! is anything still required for this to get a review?

[cau-git]

@dhdaines Thanks for this contribution. We would prefer not to put approximate information on pagination in the output document, but rather go with unpaginated document if there is no reliable source of information. I will close this PR.