Changes to Get keyword metrics

added the new path request parameter project_id

the endpoint scheme security AppOAuth was added to the API

media type application/json was changed to a more specific media type application/problem+json for the response status 400

media type application/json was changed to a more specific media type application/problem+json for the response status 401

media type application/json was changed to a more specific media type application/problem+json for the response status 403

media type application/json was changed to a more specific media type application/problem+json for the response status 404

media type application/json was changed to a more specific media type application/problem+json for the response status 422

media type application/json was changed to a more specific media type application/problem+json for the response status 429