Add commandMenu property to custom commands

schema/config.json

@@ -63,6 +63,13 @@
           "type": "string",
           "description": "The key to trigger the command. Use a single letter or one of the values from https://github.com/jesseduffield/lazygit/blob/master/docs/keybindings/Custom_Keybindings.md"
         },
+        "commandMenu": {
+          "items": {
+            "$ref": "#/$defs/CustomCommand"
+          },
+          "type": "array",
+          "description": "Instead of defining a single custom command, create a menu of custom commands. Useful for grouping related commands together under a single keybinding, and for keeping them out of the global keybindings menu.\nWhen using this, all other fields except Key and Description are ignored and must be empty."
+        },
         "context": {
           "type": "string",
           "description": "The context in which to listen for the key. Valid values are: status, files, worktrees, localBranches, remotes, remoteBranches, tags, commits, reflogCommits, subCommits, commitFiles, stash, and global. Multiple contexts separated by comma are allowed; most useful for \"commits, subCommits\" or \"files, commitFiles\".",