feat(bar): add keyboard language widget

This commit is a squashed commit containing the below commits from
PR #1266, which introduces a new "Keyboard" widget, which is used to
display information about the user's currently selected keyboard input
language. This new widget has a data refresh interval of 1 second if not
specified by the user.

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komorebi-bar/src/main.rs

@@ -3,6 +3,7 @@ mod battery;
 mod config;
 mod cpu;
 mod date;
+mod keyboard;
 mod komorebi;
 mod komorebi_layout;
 mod media;