Make dbgjs a feature flag

[ddimaria]

Creates a default featuredbgjs to core, and turns off this feature for files and multiplayer. I tested locally and no dbgjs! logs appeared in either files or multiplayer.

[qa-wolf]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.95%. Comparing base (184dab4) to head (f8ad01a).
Report is 3 commits behind head on qa.

Additional details and impacted files

@@           Coverage Diff           @@
##               qa    #2358   +/-   ##
=======================================
  Coverage   89.94%   89.95%           
=======================================
  Files         380      380           
  Lines       83720    83720           
=======================================
+ Hits        75306    75307    +1     
+ Misses       8414     8413    -1     

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