feat(keyboard): add group support for append_client_keybindings

[cnjhb]

Primarily to align with the append_global_keybindings behavior.
This feature is indeed useful, as it reduces some boilerplate code.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.46%. Comparing base (81b1efa) to head (b9768b7).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4079      +/-   ##
==========================================
- Coverage   90.47%   90.46%   -0.01%     
==========================================
  Files         940      941       +1     
  Lines       60359    60391      +32     
  Branches     1145     1145              
==========================================
+ Hits        54609    54635      +26     
- Misses       5243     5249       +6     
  Partials      507      507              

Files with missing lines	Coverage Δ
lib/awful/keyboard.lua	92.95% <100.00%> (+3.25%)	⬆️
tests/examples/awful/screenshot/keybindings1.lua	98.41% <100.00%> (+0.02%)	⬆️

... and 16 files with indirect coverage changes

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[actionless]

please add a test

[cnjhb]

please add a test

To be honest, I don't know how to add it, and I haven't found any precedents yet. I modified an existing one—see if it works for you.

[actionless]

see comment above

[actionless]

thanks! 👌😸

[Aire-One]

(I can see this is copied from module.append_global_keybindings) Maybe it should be documented as its own parameter: @tparam[opt] string keys.group If set, ...

[Aire-One]

Thank you, @cnjhb