All classes that implement LayoutInterface in Drupal 9

class \Drupal\Core\Layout\LayoutDefault implements LayoutInterface, PluginFormInterface uses ContextAwarePluginAssignmentTrait, ContextAwarePluginTrait
class \Drupal\bootstrap_layout_builder\Plugin\Layout\BootstrapLayout implements ContainerFactoryPluginInterface uses ResponsiveTrait
class \Drupal\bootstrap_layout_builder\Plugin\Layout\BootstrapLayout implements ContainerFactoryPluginInterface
class \Drupal\dashboards\Layouts\SectionLayout implements PluginFormInterface
class \Drupal\field_layout_test\Plugin\Layout\TestLayoutContentFooter
class \Drupal\field_layout_test\Plugin\Layout\TestLayoutMainFooter
class \Drupal\layout_builder\Plugin\Layout\BlankLayout
class \Drupal\layout_builder\Plugin\Layout\MultiWidthLayoutBase implements PluginFormInterface
class \Drupal\layout_builder\Plugin\Layout\ThreeColumnLayout
class \Drupal\layout_builder\Plugin\Layout\TwoColumnLayout
class \Drupal\layout_builder_test\Plugin\Layout\LayoutBuilderTestPlugin
class \Drupal\layout_builder_test\Plugin\Layout\LayoutWithoutLabel
class \Drupal\layout_builder_test\Plugin\Layout\TestContextAwareLayout
class \Drupal\layout_test\Plugin\Layout\LayoutTestDependenciesPlugin implements DependentPluginInterface
class \Drupal\layout_test\Plugin\Layout\LayoutTestPlugin implements PluginFormInterface

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