Issue #3295928: Add Drush generator commands

src/Generators/lib/di.twig

+{% macro arguments(services) %}
+  {% for service_id, service in services %}'@{{ service_id }}'{{ loop.last ? '' : ', ' }}{% endfor %}
+{% endmacro %}
+{% macro use(services) %}
+  {% sort %}
+    {% for service in services %}
+use {{ service.type }};
+    {% endfor %}
+  {% endsort %}
+{% endmacro %}
+{% macro properties(services) %}
+  {% for service in services %}
+  /**
+   * {{ service.description }}
+   *
+   * @var \{{ service.type }}
+   */
+  protected ${{ service.name|camelize(false) }};{{ loop.last ? '' : "\n\n" }}
+  {%- endfor %}
+{% endmacro %}
+{% macro annotation(services) %}
+  {% for service in services %}
+   * @param \{{ service.type }} ${{ service.name }}
+   *   {{ service.description }}{{ loop.last ? '' : "\n" }}
+   {%- endfor %}
+{% endmacro %}
+{% macro signature(services) %}
+  {% for service in services %}{{ service.short_type }} ${{ service.name }}{{ loop.last ? '' : ', ' }}{% endfor %}
+{% endmacro %}
+{% macro assignment(services) %}
+  {% for service in services %}
+    $this->{{ service.name|camelize(false) }} = ${{ service.name }};{{ loop.last ? '' : "\n" }}
+  {%- endfor %}
+{% endmacro %}
+{% macro container(services) %}
+  {% for service_id, service in services %}
+      $container->get('{{ service_id }}'){{ loop.last ? '' : ",\n" }}
+  {%- endfor %}
+{% endmacro %}
+