Feat main app implement reactive form

Beginning of the implementation of https://gitlab.com/LibreFoodPantry/modules/visitmodule-tp/updateguest/Plan/-/issues/41 (for the main app component).

• Adds Reactive Forms to the front end.
• Creates testing configuration for testing Reactive form components.
• Begins implementation of Reactive Form in the main component, along with a test for the ID number input

Resources used:

• https://stackoverflow.com/questions/48959037/angular-5-no-provider-for-controlcontainer

• https://angular.io/guide/reactive-forms

• https://youtu.be/nofXAkAz05Q?t=551 - this video is very similar to the Angular Reactive Forms guide but contains helpful information about accessing individual form group controls.

• Kyle's Angular Test project and code from this for creating the setup and tests.