Add volume and act metadata in IIIF manifests

Since volume metadata can be imported with the new manifest importer, this adds volume and act metadata to the dynamically generated manifests. They become visible in UV and Mirador.

Codecov Report

Merging #147 into master will increase coverage by 0.04%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
+ Coverage   71.32%   71.37%   +0.04%     
==========================================
  Files         176      176              
  Lines        7693     7706      +13     
==========================================
+ Hits         5487     5500      +13     
  Misses       2206     2206

Impacted Files	Coverage Δ
arkindex/documents/tests/test_volume_manifest.py	100% <100%> (ø)
arkindex/documents/serializers/iiif/manifests.py	83.33% <100%> (+1.14%)

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approved this merge request

merged

mentioned in commit 9de3a947