feat (help): allow cli option to list tasks with no desc

added an add'l cli option that lists all tasks, with or without description.
orig. behavior: task -l lists tasks with desc field
new behaviour: task -la or task -a will list all tasks. if task has desc, it will be included.

BREAKING CHANGES: none, that I know of.
NOTES/Concerns:
- This is wip.
- Haven't checked how it interacts with bash completion.
- The new Executor.TaskNames func does not use e.CompiledTask(taskfile.Call{Task: task.Task})

cmd/task/task.go

@@ -57,6 +57,7 @@ func main() {
 		helpFlag    bool
 		init        bool
 		list        bool
+		listAll     bool
 		status      bool
 		force       bool
 		watch       bool
@@ -75,6 +76,7 @@ func main() {
 	pflag.BoolVarP(&helpFlag, "help", "h", false, "shows Task usage")
 	pflag.BoolVarP(&init, "init", "i", false, "creates a new Taskfile.yml in the current folder")
 	pflag.BoolVarP(&list, "list", "l", false, "lists tasks with description of current Taskfile")
+	pflag.BoolVarP(&listAll, "list-all", "a", false, "list tasks with or without a description")
 	pflag.BoolVar(&status, "status", false, "exits with non-zero exit code if any of the given tasks is not up-to-date")
 	pflag.BoolVarP(&force, "force", "f", false, "forces execution even when the task is up-to-date")
 	pflag.BoolVarP(&watch, "watch", "w", false, "enables watch of the given task")
@@ -148,8 +150,8 @@ func main() {
 		return
 	}
 
-	if list {
-		e.PrintTasksHelp()
+	if list || listAll {
+		e.PrintTasksHelp(listAll)
 		return
 	}