Add storage for encoding/decoding should_skip

[mgarrard]

Summary: This is the fiinal p0 follow up to the stack from 52-57, and in this diff we add storage for this field :)

Differential Revision: D64519394

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D64519394

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.78%. Comparing base (52444a4) to head (1cc13ef).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2905   +/-   ##
=======================================
  Coverage   95.78%   95.78%           
=======================================
  Files         504      504           
  Lines       49790    49817   +27     
=======================================
+ Hits        47692    47718   +26     
- Misses       2098     2099    +1     

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