Update plugin architecture

[dalyIsaac]

Core

• Renamed ICommandItemContainer.Add(string commandIdentifier, ...) to ICommandItemContainer.SetKeybind(string commandIdentifier, ...). This better reflects the method's purpose.
• Added tests for the core commands.

Plugins

• Plugins now all have unique names. This is enforced by the PluginManager.
• IPlugin.GetCommands is now IPlugin.Commands.
• Plugins which provide commands via IPlugin.Commands also have a class PluginNameCommands, where each command is individually accessible. This makes them easier to test.
• Added tests for all the PluginNameCommands classes.
• Refactored plugins to have their own interfaces. This facilitates mocking for testing.

[codecov-commenter]

Codecov Report

Base: 42.66% // Head: 46.34% // Increases project coverage by +3.68% 🎉

Coverage data is based on head (0bcf980) compared to base (e6ec965).
Patch coverage: 78.41% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #209      +/-   ##
==========================================
+ Coverage   42.66%   46.34%   +3.68%     
==========================================
  Files          89       98       +9     
  Lines        4360     4646     +286     
  Branches      559      577      +18     
==========================================
+ Hits         1860     2153     +293     
+ Misses       2402     2392      -10     
- Partials       98      101       +3     

Impacted Files	Coverage Δ
src/Whim.CommandPalette/CommandPalettePlugin.cs	0.00% <0.00%> (ø)
src/Whim.FloatingLayout/FloatingLayoutPlugin.cs	0.00% <0.00%> (ø)
src/Whim/Commands/CommandItemContainer.cs	90.42% <ø> (ø)
src/Whim/Commands/CommandManager.cs	0.00% <0.00%> (ø)
src/Whim/ConfigContext/ConfigContext.cs	0.00% <0.00%> (ø)
src/Whim/Plugin/PluginManager.cs	0.00% <0.00%> (ø)
src/Whim.Gaps/GapsPlugin.cs	70.00% <57.14%> (ø)
src/Whim.FloatingLayout/FloatingLayoutCommands.cs	82.85% <82.85%> (ø)
src/Whim.Gaps/GapsCommands.cs	84.09% <84.09%> (ø)
src/Whim/Commands/CoreCommands.cs	86.04% <86.04%> (ø)
... and 10 more

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