Add CLI flag to pre-create namespaces

[jlegrone]

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[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@2094b2e). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main       #5   +/-   ##
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  Coverage        ?   46.47%           
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  Files           ?       23           
  Lines           ?     2201           
  Branches        ?        0           
=======================================
  Hits            ?     1023           
  Misses          ?     1109           
  Partials        ?       69           

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