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packaging: add command line flag to add extra vars to pyoxidizer

Authored by durin42.

Description

packaging: add command line flag to add extra vars to pyoxidizer

This felt simpler than the previous incarnation of injecting
content into the WiX build. I decided the easiest way to pass
an arbitrary map into the process was some json - I may regret this,
but time will tell on that.

Differential Revision: https://phab.mercurial-scm.org/D11093