Layout engine YAML config

[dalyIsaac]

• Added a mechanism to specify the layout engines for all workspaces.
• Added config options to customize each layout engine.
• Renamed filter_type and router_type to type.
• Cursory docs.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 92.80576% with 10 lines in your changes missing coverage. Please review.

Project coverage is 80.73%. Comparing base (0000b43) to head (ded5a46). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Whim.Yaml/YamlLayoutEngineLoader.cs	95.41%	4 Missing and 1 partial :warning:
src/Whim.Yaml/YamlLoader.cs	20.00%	2 Missing and 2 partials :warning:
src/Whim.Yaml/YamlLoaderUtils.cs	0.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1035 +/- ## ========================================== + Coverage 80.54% 80.73% +0.18% ========================================== Files 280 281 +1 Lines 11989 12123 +134 Branches 1374 1390 +16 ========================================== + Hits 9657 9787 +130 - Misses 2158 2161 +3 - Partials 174 175 +1 ```

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