StorageComparer thinks tvi.taxonomy_vocabulary.NAME.yml is a renamed version of taxonomy.vocabulary.NAME.yml

Core's StorageComparer class thinks tvi.taxonomy_vocabulary.NAME.yml is a renamed version of taxonomy.vocabulary.NAME.yml. This is caused by the fact that tvi_submit_handler sets the configuration entity's uuid to the same uuid as the vocabulary.

This isn't a problem when the tvi config is imported separately from the vocabulary config, but when they get imported together StorageComparer checks their uuids and falsely determines that one is actually a rename of the other. tvi is obviously wrong here because a config entity's uuid should be set by Drupal's config system and not by any implementing code.

The attached patch fixes this by storing the uuid under the vocabulary_uuid key.