sbc-common-components: update BaseAddress to be validatable

It would be ideal if BaseAddress was validatable so that a form wrapper could tell if it was valid or not.

Currently we have to explicitly validate the BaseAddress component and then use logic to see if it's invalid, and this still doesn't cause the form to be invalid without a work-around.

Ideally, we could just drop a BaseAddress component in a Vuetify form and the form and its children would validate (and reset!) automatically and correctly according to the Validatable API. (This should also support lazy-validation.)

https://stackoverflow.com/questions/65410355/how-to-create-a-vform-component-with-validation-functionality-like-vuetify-in-vu

Start by locating the BaseAddress component and reviewing how Vuetify's Validatable API handles validation, reset, and lazy-validation. Done means a BaseAddress placed in a Vuetify form participates in form and child validation and reset behavior without an explicit validation workaround.

Written by the indexing model from the issue text.