feat: Adding Colemak

[New9c]

TLDR I tried adding Colemak as a keyboard layout.

After a recent sudo pacman -Syu, Arch Hyprland seemed to have realized my default keyboard is colemak, which is great, except for the fact that bopomofo is now all out of whack.
I found this:
https://blog.louie.lu/2024/11/15/colemak-dh-keyboard-layout-and-bopomofo-input/
so I'll see if I can do the same with just colemak.
Tests seem to be gitignored, so I'm not sure if I should write one.

[kanru]

Ouch, CI broke due to recent rustup update. I'll fix it tomorrow.

[New9c]

Should Colemak always be below Workman?
For future maintaining sake?

[kanru]

Should Colemak always be below Workman? For future maintaining sake?

The numerical mapping only matters for C interface compatibility. For the enum in code we can group them together.

[New9c]

The tests say that the return value of chewing_KBStr2Num is wrong I think?
I don't quite get it, I believe I've set Colemak as the 16th layout.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.86%. Comparing base (2d0cdd7) to head (724214b).
Report is 10 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #674      +/-   ##
==========================================
+ Coverage   89.85%   89.86%   +0.01%     
==========================================
  Files          42       43       +1     
  Lines        8763     8775      +12     
==========================================
+ Hits         7874     7886      +12     
  Misses        889      889              

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