Allow plugins to add their own context data for automation editor

[PREMIUM-215]

mailpoet/lib/Automation/Engine/Registry.php

@@ -22,6 +22,9 @@ class Registry {
   /** @var array<string, Action> */
   private $actions = [];
 
+  /** @var array<string, callable> */
+  private $contextFactories = [];
+
   /** @var WordPress */
   private $wordPress;
 
@@ -107,6 +110,15 @@ class Registry {
     return $this->actions;
   }
 
+  public function addContextFactory(string $key, callable $factory): void {
+    $this->contextFactories[$key] = $factory;
+  }
+
+  /** @return callable[] */
+  public function getContextFactories(): array {
+    return $this->contextFactories;
+  }
+
   public function onBeforeAutomationSave(callable $callback, int $priority = 10): void {
     $this->wordPress->addAction(Hooks::AUTOMATION_BEFORE_SAVE, $callback, $priority);
   }