Consume Opendatasoft Explore API
The data.economie.gouv.fr API uses Opendatasoft Explore API,
a commercial product with an API to query datasets information.
Plan is to query attachments for FANTOIR dataset, to know when
a new file is published.
This library implements all the methods, but doesn't currently
support API optional arguments.
Test Plan: Used in D2738.
Reviewed By: dereckson
Maniphest Tasks: T1750
Differential Revision: https://devcentral.nasqueron.org/D2745