Add support for Model-less single-result API calls

[skylardarkfox]

Not everything needs a full result set. For things that return a single value, the API should be able to process this without bothering with Model generation - just a single procedure.

[skylardarkfox]

oneShot() has been added as a standalone function to run a Velox procedure one time outside the scope of a Model. The endpoint code and API call syntax just needs to be adjusted so that oneShot() is called when it's needed.

[skylardarkfox]

API integration of oneShot() will be deferred for now. The function itself will remain part of the 1.0 release, but the API may be shifted to a separate repo to simplify installation.

[skylardarkfox]

API has been moved to a separate repo. No further work needs done on the Velox Server side, so this issue will be transferred to the API repo.