feat: Add mock server functionality to CLI

[dragonmantank]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 86.45833% with 13 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@dcd3fab). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/commands/mock.js	86.17%	11 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #148   +/-   ##
=======================================
  Coverage        ?   78.23%           
=======================================
  Files           ?      101           
  Lines           ?     3579           
  Branches        ?      869           
=======================================
  Hits            ?     2800           
  Misses          ?      704           
  Partials        ?       75           

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[dragonmantank]

Not sure why the Windows stuff is crashing now, since it's a bunch of stuff outside of the new code