Integrate apiCheck for form-validation and form-layout schema validation

@kentcdodds 's [apiCheck.js](https://github.com/kentcdodds/apiCheck.js) seems promising for runtime validation of both form-validation and form-layout schemas. We should integrate with it for the debug build of Forms JS and remove it entirely for the production build*.

\* This is assuming we don't want production validation due to a negative impact on performance. As we have not verified how much of a negative impact apiCheck.js will have on performance, it is fair to question this decision.

Start by reviewing apiCheck.js and the existing form-validation and form-layout schema definitions. Then inspect the debug and production build configuration to determine where validation should be included or removed. Done means both schemas are validated in debug builds, omitted from production builds, and the performance trade-off is documented or resolved.

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