Implement Workspace entity

[ivlevdenis]

https://github.com/toggl/toggl_api_docs/blob/master/chapters/workspaces.md

Sub tasks (updated 25/09/24):

• Implement Workspace creation #79
• Implement Workspace update #80
• Implement my Workspaces fetching #81
• Implement Workspace preferences fetching #82
• Implement Workspace preferences update #83
• Implement Workspace Alert creation #84
• Implement Workspace Alert deletion #85
• Implement Workspace statistics fetching #86
• Implement statistics for all Workspaces in the Organization #87
• Implement changing assignments of users in Workspace #88

[nifadyev]

According to migration guide, a lot of paths and endpoints are now under /workspaces path. That is why proper API V9 support requires deep refactoring.

[nifadyev]

Rough plan:

• Necessary endpoints (available on free plan):
  • GET /me/workspaces
  • GET/PUT /workspaces/{workspace_id}
  • GET/POST /workspaces/{workspace_id}/preferences
  • POST/DELETE /workspaces/{workspace_id}/alerts
  • GET /workspaces/{workspace_id}/statistics
  • GET /organizations/{organization_id}/workspaces/statistics
  • PUT /organizations/{organization_id}/workspaces/{workspace_id}/assignments
  • POST /organizations/{organization_id}/workspaces
• Cover new logic with tests and type annotations