Implementation/67278 add api v3 workspaces

[ulferts]

Ticket

https://community.openproject.org/wp/67278

What are you trying to accomplish?

• Add index endpoints with full capability of the typical OP index endpoint(i.e. filtering, ordering, signaling, pagintion, ...)
  • GET api/v3/workspaces
  • GET api/v3/portfolios
  • GET api/v3/programs
• Add show endpoints for portfolios and programs
  • GET api/v3/portfolios/:id
  • GET api/v3/programs/:id
• Add Portfolio and Program as resources of their own.
• Move auxiliary endpoints scoped before under api/v3/projects/:id to be under api/v3/workspaces/:id. E.g. api/v3/workspaces/:id/available_assignees. The projects routes will continue to work but the main route, linked in the representers, will be the workspaces one.
• Change auxiliary endpoints in the representers (e.g. projects, memberships and work_packages)
• Document added and changed routes
• Add workspace alias to representers next to projects (e.g. memberships and work_packages)
• Remove update and delete link from project representer or provide endpoints (move to workspaces in this case)
• Move projects/schema to workspaces/schema
  • Change type in "parent" property
  • Change self link
• Change context links from project to workspace

Merge checklist

• Added/updated tests
• Added/updated documentation in Lookbook (patterns, previews, etc)
• Tested major browsers (Chrome, Firefox, Edge, ...)