Web App: UI for A5-D2

[smiththay]

• [x] Define the A5-D2 model with all necessary properties
• [x] Update all mappers and form fields
• [x] Validate fields with Regex, range, custom validation, etc.
• [x] Add form to form contract
• [x] Update A5-D2 UI to match NACC documentation.
• [x] Modify enable/disable behavior and implement on UI
• [x] Insure form matches NACC documentation with correct UI, logic, validation, behavior and ensure data is saving correctly

View Docs: https://github.com/naccdata/uniform-data-set/tree/main/forms/uds/a5d2