feat(shortcuts): add helper written in egui

This commit adds a simple egui helper application which shows a list of
shortcuts defined in a user's whkdrc file. Parsing AHK files is not
supported.

In addition to listing out shortcuts defined in the whkdrc file, the top
line allows users to add filter a filter to narrow down the list of
commands and key bindings to the ones they are interested in.

A new komorebic command "toggle-shortcuts" has been introduced which
will first attempt to kill "komorebi-shortcuts.exe", and then exit if
the kill signal was successful (ie. a process was closed), or proceed to
open "komorebi-shortcuts.exe" if the kill signal was not successful (ie.
no process was closed, so we should open one).

"komorebi-shortcuts.exe" has been added as a floating application in
lib.rs to allow for users to use the "komorebic move" command to
manipulate its position via their existing keyboard bindings.

Cargo.toml

@@ -8,7 +8,8 @@ members = [
     "komorebic",
     "komorebic-no-console",
     "komorebi-bar",
-    "komorebi-themes"
+    "komorebi-themes",
+    "komorebi-shortcuts"
 ]
 
 [workspace.dependencies]
@@ -72,4 +73,4 @@ features = [
     "Win32_System_WindowsProgramming",
     "Media",
     "Media_Control"
-]
+]