[WIP] Breaking change: Rename Stage to Volume

[lentitude2tk]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (2.6@e93d548). Learn more about missing BASE report.

Additional details and impacted files

@@          Coverage Diff           @@
##             2.6    #3091   +/-   ##
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  Coverage       ?   45.07%           
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  Files          ?       65           
  Lines          ?    13772           
  Branches       ?        0           
======================================
  Hits           ?     6208           
  Misses         ?     7564           
  Partials       ?        0           

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