WIP: Feat link form groups

This branch links together the different form groups for the individual Angular components so data is passed back to the main component for submission to the backend.

Resources used:

• https://medium.com/@tomastrajan/angular-reactive-sub-forms-type-safe-without-duplication-dbd24225e1e8 - Most of this implementation comes from the code shown in this article (specifically mostly looking at the "Better sub-form component" solution).
• Gloris's Age and Employment branch