Always expose the workspace id when adding a workspace

[dalyIsaac]

Previously, context.WorkspaceManager.Add() would return null in the csx. This was because it would only return IWorkspace once Whim had completed initialization.

Now, context.WorkspaceManager.Add() will return the Guid of the workspace that was added. This allows you to utilize the workspace id when setting up commands or other functionality that requires the workspace id.

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 81.04%. Comparing base (f497291) to head (c6ab72a).
Report is 1 commits behind head on main.

Files	Patch %	Lines
...nitorSector/Transforms/MonitorsChangedTransform.cs	50.00%	0 Missing and 1 partial ⚠️
src/Whim/Workspace/WorkspaceManager.cs	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #977   +/-   ##
=======================================
  Coverage   81.04%   81.04%           
=======================================
  Files         274      274           
  Lines       11295    11303    +8     
  Branches     1277     1279    +2     
=======================================
+ Hits         9154     9161    +7     
  Misses       1970     1970           
- Partials      171      172    +1     

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[urob]

That's great! It'll allow me to get rid of some ugly hacks in my csx to refer to workspaces I create