Returns all environments in the project, in pages of 20.

A successful response looks like:

{ 'err': 0 'result': { 'page': 1, 'environments': [ // where each environment has the shape: { 'id': 1, 'project_id': 123, 'environment': 'production', // visibility of the environment in the app (can either be 1 or 0) 'visible': 1 }, ... ] } }