This creates a basic object with minimal search functionality. It currently uses a dummy ProvidersManager that can be replaced once we get the real one.
There are two test files, the unit one is aiming to test at a unit level - stubbing out the manager, and checking the functionality works correctly.
The second is for checking integration with the providers manager, and it does the right things when linked together. For now, this has just a simple check that uses the dummy ProvidersManager for the case of returning a single result matching the URL.
Depends on D4566
Differential Revision: https://phabricator.services.mozilla.com/D4973
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extra : moz-landing-system : lando
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