added the Query capability to the list items/wishlist endpoints

[wyam1]

Added some code here without the test cases. Hoping for one of you @aklufas or @jku8 to take a look at the code and then we can start writing the test cases together.

[aklufas]

@jku8 can you take a look at this? the test I was trying to write doesn't work and I'm stuck

test_routes.py > lines 180ish query_wishlists_by_name

[jku8]

@aklufas @wyam1 you also need to modify the routes.py file for the /wishlists and /items endpoint to handle the query logic. You can do this with an if, else.

[aklufas]

Updated, struggling with creating a create_items() helper function.

[aklufas]

@jku8 - finished the tests, this is ready for review!

[ajaffery08]

LGTM