feat(editor): Add workman layout support

[kanru]

Fixes #231

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 4 lines in your changes missing coverage. Please review.

Project coverage is 89.41%. Comparing base (a40f7c7) to head (2a874ec).

Files	Patch %	Lines
src/editor/keyboard/workman.rs	0.00%	3 Missing ⚠️
src/editor/keyboard/mod.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #606      +/-   ##
==========================================
- Coverage   89.44%   89.41%   -0.04%     
==========================================
  Files          39       40       +1     
  Lines        8586     8598      +12     
==========================================
+ Hits         7680     7688       +8     
- Misses        906      910       +4     

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