Issue #3236171 by kim.pepper, jibran, mortim07: Add pluggable outputs

composer.json

config/install/data_pipelines.settings.yml

config/schema/data_pipelines.schema.yml

data_pipelines.info.yml

data_pipelines.install

data_pipelines.links.action.yml

data_pipelines.links.menu.yml

data_pipelines.post_update.php

data_pipelines.routing.yml

data_pipelines.services.yml

modules/data_pipelines_elasticsearch/composer.json

...rch/config/schema/data_pipelines_elasticsearch.schema.yml

...lines_elasticsearch/data_pipelines_elasticsearch.info.yml

...elines_elasticsearch/data_pipelines_elasticsearch.install

...s_elasticsearch/data_pipelines_elasticsearch.services.yml

...elines_elasticsearch/src/ElasticSearchDatasetPipeline.php

...sticsearch/src/Exception/CouldNotCreateIndexException.php

...rch/src/Exception/DatasetNotRemovedFromIndexException.php

...rc/Plugin/DatasetDestination/ElasticSearchDestination.php

...test/data_pipelines_elasticsearch_test.data_pipelines.yml