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tools: add libinput analyze buttons for button state analysis

Peter Hutterer requested to merge whot/libinput:wip/analyze-buttons into main

This tool helps with tracking button states and time deltas between button events. Example output for a mouse with LMR buttons recorded (the mouse also has BTN_SIDE and BTN_EXTRA):

  Timestamp   │  Delta   │ L │ R │ M │ S │ E
     0.596112 │    142ms │ ┬ │   │   │   │
     0.689096 │     92ms │ ┴ │   │   │   │
     1.129056 │    439ms │ ┬ │   │   │   │
     1.308178 │    179ms │ ┴ │   │   │   │
     1.469149 │    136ms │ ┬ │   │   │   │
     1.598096 │    128ms │ ┴ │   │   │   │
     1.862125 │    264ms │ ┬ │   │   │   │
     2.084234 │    222ms │ │ │ ┬ │   │   │
     2.415224 │    330ms │ │ │ ┴ │   │   │
     2.831227 │    416ms │ │ │ ┬ │   │   │
     3.215067 │    383ms │ ┴ │ │ │   │   │
     3.525230 │    310ms │ ┬ │ │ │   │   │
     3.629006 │    103ms │ ┴ │ │ │   │   │
     3.813078 │    184ms │ ┬ │ │ │   │   │
     3.909170 │     96ms │ ┴ │ │ │   │   │
     4.093180 │    184ms │ ┬ │ │ │   │   │
     4.317036 │    223ms │ ┴ │ │ │   │   │
     4.507175 │    190ms │ ┬ │ │ │   │   │
     4.587105 │     79ms │ │ │ ┴ │   │   │
     4.779211 │    192ms │ ┴ │   │   │   │
     5.075239 │    296ms │   │   │ ┬ │   │
     5.259097 │    183ms │   │   │ ┴ │   │
     5.379082 │    119ms │   │   │ ┬ │   │
     5.483044 │    103ms │   │   │ ┴ │   │

The default behavior is to highlight time deltas below 25ms in red. 25ms is our higher debounce timeout.

Motivated by #1003 (closed), cc @stef204

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