Add script to request model versions

[anth-volk]

Fixes #2530

Adds a Bash script to invoke the simulation API's `wait_for_country_version" Google Cloud workflow. This workflow uses a polling structure to asynchronously determine the simulation API's model versions and return SUCCESS if they match the ones provided to the script, or to fail if not.

In a future PR, I will run this script as part of a Google Cloud workflow, passing in the API deployment's model versions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.62%. Comparing base (8b08421) to head (38c5f8f).
Report is 12 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2531   +/-   ##
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  Coverage   63.62%   63.62%           
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  Files          56       56           
  Lines        2161     2161           
  Branches      287      287           
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  Hits         1375     1375           
  Misses        729      729           
  Partials       57       57           

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[mikesmit]

LGTM

[mikesmit]

LGTM (for reals)