DrawerNavGroup Title Divider Prop

[daileytj]

Describe the desired behavior

A user should be able to toggle on/off the divider that comes after the DrawerNavGroup title via a prop (e.g., titleDivider: boolean)

Describe the current behavior

If the DrawerNavGroup has a title, a divider is provided below the title by default and cannot be disabled.

Is this request related to a current issue?

No

Additional Context

We may want to have a titleDividerPosition: 'top' | 'bottom' prop as well, so that the divider can be positioned above or below the DrawerNavGroup title depending on the context.

The titleDivider prop should have a default value of true to maintain backwards compatibility.

[daileytj]

Let's keep the logic simple here and not add the titleDividerPosition. The user can add a divider where they want between the nav groups.