Update Commerce entity anotation per #2309187 in Core.
CommerceProductListBuilder buildRow $langcode is not defined. #2320509
Merge pull request #43 from mglaman/2320509

CommerceProductListBuilder buildRow $langcode is not defined.
Merge pull request #40 from mglaman/2309187

Updates Commerce entity annotation per #2309187
Initial tests for the commerce_store and commerce_store_type entities