Add access arguments to the entity info for line items and payment transactions

It appears that we did not add the "access arguments" array to these entity type definitions because they use custom access callbacks, commerce_line_item_access() and commerce_payment_transaction_access() respectively. However, we still do entity access query altering for these entity types via a pass-through order access check. I have a use case in Commerce Services where I was looking for the access tag in entity info arrays to know if I should be adding a tag to indexing queries for these entity types, so it would be useful to have the access arguments even though they wouldn't directly be used by commerce_entity_access_query_alter(). The attached patch adds the arguments; it's tested working fine in my Commerce Services code.