Add search parameter

[AdamVig]

As a Stockpile user, I want to search my inventory so that I can find things more quickly.

• [ ] Research how to implement search with MySQL
• [ ] Pass through search criteria from "get all" request as a parameter
• [ ] Add search method to database service
• [ ] Document query parameters for search on "get all" requests

[AdamVig]

Moving to #296.