Add VM keyboard capture feature

[faklapant23]

Fixes: https://github.com/QubesOS/qubes-issues/issues/9785

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 76.13%. Comparing base (2965dd1) to head (e22839f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #388      +/-   ##
==========================================
- Coverage   76.16%   76.13%   -0.03%     
==========================================
  Files          53       53              
  Lines        9245     9245              
==========================================
- Hits         7041     7039       -2     
- Misses       2204     2206       +2     

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