Issue #3215938 by paul121: Data stream email notifications

...nfig/schema/data_stream_notification.condition.schema.yml

...fig/schema/data_stream_notification.data_types.schema.yml

...onfig/schema/data_stream_notification.delivery.schema.yml

...ication/config/schema/data_stream_notification.schema.yml

...am/modules/notification/data_stream_notification.info.yml

...es/notification/data_stream_notification.links.action.yml

...ream/modules/notification/data_stream_notification.module

...modules/notification/data_stream_notification.routing.yml

...odules/notification/data_stream_notification.services.yml

...les/notification/src/Annotation/NotificationCondition.php

...ules/notification/src/Annotation/NotificationDelivery.php

.../notification/src/Controller/NotificationUIController.php

...es/notification/src/DataStreamNotificationListBuilder.php

...tification/src/DataStreamNotificationPluginCollection.php

...odules/notification/src/Entity/DataStreamNotification.php

...tification/src/Entity/DataStreamNotificationInterface.php

...ication/src/EventSubscriber/DataStreamEventSubscriber.php

...ules/notification/src/Form/DataStreamNotificationForm.php

...modules/notification/src/NotificationConditionManager.php

...otification/src/NotificationConditionManagerInterface.php