Add MonitorSector

[dalyIsaac]

The MonitorManager no longer stores or directly interacts with monitors. Instead, the monitor manager now calls pickers and transforms for the MonitorSector of the Store.

[codecov]

Codecov Report

Attention: Patch coverage is 94.59459% with 38 lines in your changes are missing coverage. Please review.

Project coverage is 81.60%. Comparing base (bb77d9c) to head (6129384).

Files	Patch %	Lines
src/Whim.TestUtils/Assert.cs	76.78%	11 Missing and 2 partials ⚠️
src/Whim/Butler/ButlerEventHandlers.cs	94.70%	7 Missing and 2 partials ⚠️
src/Whim/Butler/ButlerChores.cs	97.66%	3 Missing and 3 partials ⚠️
...im.Bar/ActiveLayout/ActiveLayoutWidgetViewModel.cs	91.17%	2 Missing and 1 partial ⚠️
src/Whim.TestUtils/MonitorTestUtils.cs	94.33%	2 Missing and 1 partial ⚠️
src/Whim.Bar/Workspace/WorkspaceWidgetViewModel.cs	96.92%	0 Missing and 2 partials ⚠️
....Bar/FocusedWindow/FocusedWindowWidgetViewModel.cs	97.72%	0 Missing and 1 partial ⚠️
src/Whim/Context/Context.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #894      +/-   ##
==========================================
+ Coverage   80.81%   81.60%   +0.79%     
==========================================
  Files         206      219      +13     
  Lines       10251    10455     +204     
  Branches     1148     1175      +27     
==========================================
+ Hits         8284     8532     +248     
+ Misses       1851     1801      -50     
- Partials      116      122       +6     

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