Field Label and Sub-Label Placement Logic

[mosesintech]

Describe the solution you'd like
All fields have support for the label string, but there is currently no support for labelPlacement or subLabelPlacement.

labelPlacement can be either "HIDDEN" or "INHERIT".
subLabelPlacement can be "INHERIT", "BELOW", "ABOVE", or null. These four map to the four options in WP: "Use Form Setting", "Below inputs", "Above inputs", and "Hidden", respectively.