Add the org-clock-waybar-output-task function

It outputs the generated JSON string to the standard output so it can
be used directly from the command line, e.g. using `emacsclient`.

org-clock-waybar.el

@@ -95,6 +95,14 @@ value of `org-clock-waybar-not-clocked-in-text'."
     (insert (org-clock-waybar--get-clocked-task-json))
     (write-file org-clock-waybar-filename)))
 
+(defun org-clock-waybar-ouptut-task ()
+  "Output the current task in JSON format Waybar can understand.
+
+This function is ought to be used via Emacsclient:
+
+emacsclient --eval '(org-clock-waybar-output-task)'"
+  (print (org-clock-waybar--get-clocked-task-json)))
+
 (defun org-clock-waybar-setup ()
   "Setup org-clock-waybar.