Issue #2374087 by alexpott, benjy: Fixed Create a persistent comment body field storage.

...ent/config/install/field.storage.comment.comment_body.yml

core/modules/comment/src/CommentManager.php

core/modules/comment/src/CommentTypeForm.php

core/modules/comment/src/Entity/CommentType.php

...omment/src/Tests/CommentDefaultFormatterCacheTagsTest.php

core/modules/comment/src/Tests/CommentFieldAccessTest.php

core/modules/comment/src/Tests/CommentFieldsTest.php

...modules/comment/src/Tests/CommentStringIdEntitiesTest.php

core/modules/comment/src/Tests/CommentTypeTest.php

core/modules/comment/src/Tests/CommentValidationTest.php

...dules/forum/config/install/comment.type.comment_forum.yml

...ore.entity_form_display.comment.comment_forum.default.yml

...ore.entity_view_display.comment.comment_forum.default.yml

...nstall/field.field.comment.comment_forum.comment_body.yml

...m/config/install/field.field.node.forum.comment_forum.yml

...forum/config/install/field.storage.node.comment_forum.yml

core/modules/forum/forum.install

core/modules/hal/src/Tests/EntityTest.php

core/modules/hal/src/Tests/NormalizerTestBase.php

...rate/src/Plugin/migrate/destination/EntityCommentType.php