Fixes #115

Describe the Approach

• At first I added logic in the backend so if GA4 was selected as the option, the dimension fields will not even render on the frontend.
• The issue with that is when user changes the analytics type to something other than GA$, the fields won't still show as they were not rendered.
• So I went with JS approach, added classes to the table markup on settings API, to identify fields.
• Handled field visibility on analyticstype field change event.

Need to confirm if the JS should move to a new file and we create a new entry point in webpack. @Tonnie-Exelero