@ctumwebaze @mwangiann General refactoring of the FormSection functionality internal API.

As part of this refactoring;
1. All code that was dealing with form sections in the RapidFtrApplication was  moved to the FormService.
2. All the calls for forms were directed to the FormService which is injected as a dependency with guice.
3. Moved the default form sections from the raw folder to a resource file in the package to support testing without robolectric