feat[inspect]: inspects record with symbol properties

[Milly]

Note that there is no way to get the string keys and symbol keys in order, so we first enumerate the string keys, then the symbol keys.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.98%. Comparing base (f1c49f5) to head (02a38bc).
Report is 1 commits behind head on symbol-properties-wip.

Additional details and impacted files

@@                  Coverage Diff                   @@
##           symbol-properties-wip      #99   +/-   ##
======================================================
  Coverage                  97.98%   97.98%           
======================================================
  Files                         50       50           
  Lines                        794      794           
  Branches                      85       85           
======================================================
  Hits                         778      778           
  Misses                        16       16           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.