feat: libinput keys module

Adds a new module which shows the status of toggle mod keys (capslock, num lock, scroll lock).

Resolves #700

.github/scripts/ubuntu_setup.sh

@@ -17,6 +17,7 @@ $SUDO apt-get update && $SUDO apt-get install --assume-yes \
 	libssl-dev${CROSS_DEB_ARCH:+:$CROSS_DEB_ARCH} \
 	libgtk-3-dev${CROSS_DEB_ARCH:+:$CROSS_DEB_ARCH} \
 	libgtk-layer-shell-dev${CROSS_DEB_ARCH:+:$CROSS_DEB_ARCH} \
+	libinput-dev${CROSS_DEB_ARCH:+:$CROSS_DEB_ARCH} \
 	libdbusmenu-gtk3-dev${CROSS_DEB_ARCH:+:$CROSS_DEB_ARCH} \
 	libpulse-dev${CROSS_DEB_ARCH:+:$CROSS_DEB_ARCH} \
 	libluajit-5.1-dev${CROSS_DEB_ARCH:+:$CROSS_DEB_ARCH}

Cargo.toml

@@ -18,6 +18,7 @@ default = [
     "focused",
     "http",
     "ipc",
+    "keys",
     "launcher",
     "music+all",
     "network_manager",
@@ -49,12 +50,14 @@ http = ["dep:reqwest"]
 
 cairo = ["lua-src", "mlua", "cairo-rs"]
 
-clipboard = ["nix"]
+clipboard = ["dep:nix"]
 
 clock = ["chrono"]
 
 focused = []
 
+keys = ["dep:input", "dep:evdev-rs", "dep:libc", "dep:nix"]
+
 launcher = []
 
 music = ["regex"]
@@ -131,12 +134,14 @@ lua-src =  {  version = "547.0.0", optional = true }
 mlua = { version = "0.9.9", optional = true, features = ["luajit"] }
 cairo-rs = { version = "0.18.5", optional = true, features = ["png"] }
 
-# clipboard
-nix = { version = "0.29.0", optional = true, features = ["event", "fs"] }
-
 # clock
 chrono = { version = "0.4.38", optional = true, default-features = false, features = ["clock", "unstable-locales"] }
 
+# input
+input = { version = "0.9.1", optional = true }
+evdev-rs = { version = "0.6.1", optional = true }
+libc = { version = "0.2.164", optional = true }
+
 # music
 mpd-utils = { version = "0.2.1", optional = true }
 mpris = { version = "2.0.1", optional = true }
@@ -163,6 +168,7 @@ futures-util = { version = "0.3.31", optional = true }
 
 # shared
 futures-lite = { version = "2.5.0", optional = true } # network_manager, upower, workspaces
+nix = { version = "0.29.0", optional = true, features = ["event", "fs", "poll"] } # clipboard, input
 regex = { version = "1.11.1", default-features = false, features = [
   "std",
 ], optional = true } # music, sys_info