For archival objects, display "dimensions" subfield of the Extents subrecord

[faithc]

User story

A key piece of information for graphic materials in particular that staff are including the Dimensions subfield of the Extents subrecord in archival objects is not displaying on the site.

Acceptance criteria

• If this change touches any of the files referenced in .rubocop_todo.yml create a new ticket to address the rubocop todo.
• I can successfully use this feature with Voice Over in Safari.
• I have checked this feature using one of the following browser extensions and confirmed that it does not add any level A or level AA issues:
  • axe dev tools
  • Lighthouse
  • Wave
• ...

Concrete example

https://aspace.princeton.edu/staff/resources/4386#tree::archival_object_1497354 (mss repo)
https://findingaids.princeton.edu/catalog/C1778_c79837-86259

Implementation notes, if any