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]

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 ⚠️
src/Whim.Yaml/YamlLoader.cs	20.00%	2 Missing and 2 partials ⚠️
src/Whim.Yaml/YamlLoaderUtils.cs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            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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