feat: implement plugin manager

- Allows running the following from the command palette (Ctrl+;)
  - Update All Plugins: Updates all plugins
  - List All Plugins: Lists all installed plugins

plugins/plugin_mgr.lua

@@ -0,0 +1,11 @@
+--          ╭─────────────────────────────────────────────────────────╮
+--          │                     PLUGIN MANAGER                      │
+--          ╰─────────────────────────────────────────────────────────╯
+
+local M = {}
+
+local wezterm = WEZTERM
+
+PLUGIN_MGR = wezterm.plugin.require("https://gitlab.com/alecthegeek/wezterm-plugin-mgr.git")
+
+return M

plugs.lua

@@ -9,6 +9,7 @@ local plugins = {
 	"resurrect",
 	"smart_splits",
 	"tabline",
+	"plugin_mgr",
 }
 
 -- Load all plugins