[Workspace] Add workspace creator

[wanglam]

Is your feature request related to a problem? Please describe.

For now workspace only can be created by calling workspace API or index data created API. It's not convenient for using worksapce feature. Need to add a workspace create page to allow user create workspace with name, description, color and features.

Describe the solution you'd like

To add a workspace create page, we need to use core.application.register to register the new page. The workspace form and create button will be placed in the workspace create page. The workspace form will be consists of name input, description input, color picker and feature selector. The feature selector will list the registered applications and group by category.label. The create button will grab all the input data and send them to the workspace create API. Then it will show workspace create successful and redirect to the workspace overview page. The workspace overview won't need to be implemented for now.

Describe alternatives you've considered

N/A

Additional context

#4944