HasManyFieldsRow automatically adds `mb-4` className to component

[CRiva]

The HasManyFieldsRow automatically adds mb-4 className to the component, which in some cases, is just too much whitespace between the rows.

react-gears/src/components/HasManyFieldsRow.tsx

Line 42 in 0327709

const classNames = classnames('mb-4', className);

It would be better to allow the user/developer to specify their own whitespace when utilizing this component to fit their needs.

Example of too much whitespace: