Add Gantt view to Client portal views

Client using the Client portal in the asana-client-management product are currently limited to a very basic task list view under an updates view and a timeline view.

Our clients prefer a Kanban board view and a Gantt view with dependency relationships and a way to group the data in different ways.

Gantt views exist elsewhere through the product. Recommend adding it to the asana-client-management product views as well.

consistency