Use swagger and openapi files to automatically check query fields

[DDorch]

Each API is described by a swagger file (e.g.: https://hubeau.eaufrance.fr/api/vbeta/qualite_eau_potable/api-docs). The API "ecoulement" is described by an OpenAPI file (https://hubeau.eaufrance.fr/api/vbeta/ecoulement/api-docs) and this last has currently some mistakes (BRGM/hubeau#127).

It's possible by reading these files to automate the check of the fields used in a query accelerating the implementation of new API and keep synchronised evolution of the APIs without the need to update the package.

TODO:

• add swagger/openapi URL of each APIs in the package configuration
• read and parse swagger and openapi file
• extract field list for each already implemented endpoints