What are the available lenses?

Key	Class	Permission
`revenue-lens`	`Aero\Admin\Lenses\RevenueLens`	`reports.orders`
`average-order-value-lens`	`Aero\Admin\Lenses\AverageOrderValueLens`	`reports.orders`
`top-shipping-countries-lens`	`Aero\Admin\Lenses\TopShippingCountriesLens`	`reports.orders`
`return-rate-lens`	`Aero\Admin\Lenses\ReturnsRateLens`	`reports.orders`
`orders-lens`	`Aero\Admin\Lenses\OrdersLens`	`reports.orders`
`top-selling-manufacturers-lens`	`Aero\Admin\Lenses\TopSellingManufacturersLens`	`reports.catalog`
`top-selling-items-lens`	`Aero\Admin\Lenses\TopSellingItemsLens`	`reports.catalog`

The default dashboard lenses are stored in the admin configuration file, inside the dashboard_lenses array.