Implement API endpoint for Tools search.

:fork_and_knife: 

Similar to the Cookbooks search, this implements the ability to search for Tools
via the API. It is its own endpoint to not affect the Cookbooks
search endpoint.

    GET /api/v1/tools-search?q=QUERY

The start and items parameters can be provided to adjust the results with
pagination.

Trello card: https://trello.com/c/l0dyeedP